Summary
The DNAs of HSV-1 and HSV-2 showed about 65% base-sequence homology as measured by DNA-DNA hybridization experiments. Among the strains of HSV-1 and HSV-2, respectively, existed almost complete homology.The DNA of the Varicella-Zoster virus did not hybridize significantly with that of the herpes simplex viruses. The nucleic acids of ECE-, IBR- and Psr-virus did not share any homology extending the error of the hybridization technique. The specificity of the reaction was demonstrated by reciprocal saturation experiments or by competition hybridization and was proven by the melting of the DNA-DNA hybrid. The homology between HSV-1 and HSV-2 measured by hybridization of transcribed RNA to purified DNA did not exceed 50%. The other viruses did not show significant relatedness in their genetic material. The importance of the experimental results with regard to the biological properties as well as to the evolution of the herpesviruses is discussed.
Zusammenfassung
Die Basensequenz-Homologie für die Nucleinsäuren von HSV-1 und HSV-2 betrug etwa 65%, wie DNS-DNS Hybridisationsexperimente ergaben. Alle Stämme des HSV-1 bzw. HSV-2 waren untereinander in ihrer DNS nahezu vollkommen homolog. Zwischen V-Z-Virus und den Herpes Simplex-Viren bestand keine signifikante Übereinstimmung im genetischen Material. Die Nucleinsäuren von ECE-, IBR-, Psr-Virus wiesen ebenfalls keine Basensequenz-Homologie auf, die über die Fehlerbreite der Methode hinausging. — Die Spezifität der Reaktionen wurde durch reziproke Sättigungshybridisation oder durch Kompetitions-experimente erhärtet und mit dem Aufschmelzen des DNS-DNS Hybridmoleküls nachgewiesen.
Bei HSV-1 und HSV-2 konnte mit der DNS-RNS Hybridbildung in der transkribierten RNS eine Homologie gefunden werden, die 50% nicht überstieg. Die übrigen Viren zeigten auch mit dieser Untersuchungstechnik keine wesentliche Übereinstimmung in ihrem Genmaterial.
Die Bedeutung der experimentellen Befunde für die biologischen Besonderheiten sowie für die Evolution der Herpesviren wird diskutiert.
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Literatur
Wildy, P.: Classification and nomenclature of viruses. Monographs in virology, vol. 5. Basel: Karger 1971.
Biswal, N., Benyesh-Melnick, M.: Complementary nuclear RNAs of murinesarcoma-leukemia virus complex in transformed cells. Proe. nat. Acad. Sci. (Wash.)64, 1372 (1969).
Warnaar, S. O., Cohen, J. A.: A quantitative assay for DNA-DNA hybrids using membrane filters. Biochem. biophys. Res. Commun.24, 554 (1966).
Vonka, V., Benyesh-Melnick, M.: Interactions of human cytomegalovirus with human fibroblasts. J. Bact.91, 213 (1966).
Denhardt, D. T.: A membrane-filter technique for the detection of complementary DNA. Biochem. biophys. Res. Commun.23, 641 (1966).
Dulbecco, R., Vogt, M.: Plaque formation and isolation of pure lines with poliomyelitis virus. J. exp. Med.99, 167 (1954).
Youngner, J. S.: Monolayer tissue culture. I. Preparation and standardization of suspensions of trypsin-dispersed monkey kidney cells. Proc. Soc. exp. Biol. (N.Y.)85, 202 (1954).
Eagle, H.: Amino acid metabolism in mammalian cell cultures. Science130, 432 (1969).
Hayflick, L., Moorhead, P. S.: The serial cultivation of human diploid cell strains. Exp. Cell Res.25, 585 (1961).
Rapp, F., Benyesh-Melnick, M.: Plaque assay for measurement of cells infected with Zoster virus. Science141, 433 (1963).
Benyesh-Melnick, M., Rosenberg, M. S., Watson, B.: Viruses in cell cultures of kidneys of children with congenital heart malformations and other diseases. Proc. Soc. exp. Biol. (N.Y.)117, 452 (1964).
Dreesman, G. R., Benyesh-Melnick, M.: Spectrum of human cytomegalovirus complement-fixing antigens. J. Immunol.99, 1106 (1967).
Rowe, W. P., Hartley, J. W., Waterman, S., Turner, H. C., Huebner, R. J.: Cytopathogenic agent resembling human salivary gland virus recovered from tissue cultures of human adenoids. Proc. Soc. exp. Biol. (N.Y.)92, 418 (1956).
Benyesh-Melnick, M., Dessy, S. I., Fernbach, D. J.: Cytomegaloviruria in children with acute leukemia and in other children. Proc. Soc. exp. Biol. (N.Y.)117, 624 (1964).
Weller, T. H., Macauley, J. C., Craig, J. M., Wirth, P.: Isolation of intra-nuclear inclusion producing agents from infants with illnesses resembling cytomegalic inclusion disease. Proc. Soc. exp. Biol. (N.Y.)94, 4 (1957).
McCombs, R., Brunschwig, J. P., Mirkovic, R., Benyesh-Melnick, M.: Electron microscopic characterization of a herpes-like virus isolated from tree shrews. Virology45, 816 (1971).
Ludwig, H., Biswal, N., Bryans, J. T., McCombs, R.: Some properties of the DNA from a new equine herpesvirus. Virology45, 534 (1971).
Smith, K. O.: Relationship between the envelope and the infectivity of herpes simplex virus. Proc. Soc. exp. Biol. (N.Y.)115, 814 (1964).
Rapp, F.: Variants of herpes simplex virus: isolation, characterization and factors influencing plaque formation. J. Bact.89, 985 (1963).
Rawls, W. E., Laurel, D., Melnick, J. L., Glicksman, J. M., Kaufman, R. H.: A search for viruses in smegma, premalignant and early malignant cervical tissues. The isolation of herpesviruses with distinct antigenic properties. Amer. J. Epidemiol.87, 647 (1968).
—, Iwamoto, K., Adams, E., Melnick, J. L.: Measurement of antibodies to herpesvirus types 1 and 2 in human sera. J. Immunol.104, 599 (1970).
Graham, B. J., Ludwig, H., Bronson, D. L., Benyesh-Melnick, M., Biswal, N.: Physicochemical properties of the DNA of herpesviruses. Biochim. biophys. Acta (Amst.)259, 13 (1972).
Madin, S. H., York, C. J., McKercher, D. G.: Isolation of the bovine rhinotracheitis virus. Science124, 721 (1956).
Straub, O. C., Del Plab, M. C., Kleine, B.: Infektiöse Rhinotracheitis in einem Milchviehbestand. Tierärztl. Umsch.20, 23 (1965).
Mondino, G., Straub, O. C.: Vergleichende Untersuchungen an zwei europäischen Rhinotracheitisvirusstämmen. Tierärztl. Umsch.2, 569 (1966).
Hughes, J. P., Harvey, J. O., Wada, M.: Keratoconjunctivitis associated with infectious bovine rhinotracheitis. J. Amer. vet. med. Ass.145, 32 (1964).
Kendrick, J. W., Gillespie, J. M., McEntee, K.: Infectious pustular vulvo-vaginitis. Cornell Vet.47, 458 (1958).
Straub, O. C., Mäckle, N.: Ein Ausbruch des Bläschenausschlages in einer Besamungsstation. Tierärztl. Umsch.20, 113 (1965).
Steck, F., Raaflaub, W., König, H., Ludwig, H.: Nachweis von IBR-IPV-Virus, Klinik und Pathologie bei zwei Ausbrüchen von Bläschenseuche. Schweiz. Arch. Tierheilk.3, 13 (1969).
Ludwig, H., Paulsen, J., Kaminjolo, J. S.: Kälber-Corneazellen in Kultur. I. Eigenschaften einer fibroblasten- und einer epithelartigen Zellinie und deren Eignung für die Untersuchung einiger tierpathogener Viren. Z. med. Mikrobiol. u. Immunol.155, 133 (1969).
Barenfus, M., Delli Quadri, C. A., McIntyre, R. W., Schroeder, R. J.: Isolation of infectious bovine rhinotracheitis virus from calves with meningoencephalitis. J. Amer. vet. med. Ass.143, 725 (1963).
Ludwig, H., Paulsen, J.: Isolierung und fluoreszenzserologische Untersuchungen von Parainfluenza-3-Viren aus Vaginal- und Nasentupfern vom Rind. Zbl. Vet.-Med. B16, 231 (1969).
Ben-Porat, T., Kaplan, A. S.: The chemical composition of herpes simplex and pseudorabies virus. Virology16, 261 (1962).
Smith, K. O., Melnick, J. L.: A method for staining virus particles and identifying their nucleic acid type in the electron microscope. Virology17, 480 (1962).
McCombs, R. M., Benyesh-Melnick, M., Brunschwig, J. P.: Biophysical studies of vesicular stomatitis virus. J. Bact.91, 803 (1966).
—, Benyesh-Melnick, M., Brunschwig, J. P.: The use of millipore filters in ultrastructural studies of cell cultures and viruses. J. Cell Biol.36, 231 (1968).
Solymosy, F., Fedorsák, I., Gulyás, A., Farkas, G. L., Ehrenberg, L.: A new method based on the use of diethylpyrocarbonate as a nuclease inhibitor for the extraction of undegraded nucleic acid from plant tissues. Europ. J. Biochem.5, 520 (1968).
Flamm, W. G., Bond, H. E., Burr, H. E.: Density-gradient centrifugation of DNA in a fixed-angle rotor. A higher order of resolution. Biochim. biophys. Acta (Amst.)129, 310 (1966).
Biswal, N., Kleinschmidt, A. K., Spatz, H. C., Trautner, T. A.: Physical properties of the DNA of bacteriophage SP 50. Molec. Gen. Genetics100, 39 (1967).
Schildkraut, C. L., Maio, J. J.: Studies on the intranuclear distribution and properties of mouse satellite DNA. Biochim. biophys. Acta (Amst.)161, 76 (1968).
Ludwig, H., Biswal, N., Benyesh-Melnick, M.: Characterization of DNA isolated from metaphase chromosomes of cells containing Epstein-Barr virus. Biochim. biophys. Acta (Amst.)232, 261 (1971).
Ifft, J.B., Voet, D.H., Vinograd, J.: The determination of density distributions and density gradients in binary solutions at equilibrium in the ultracentrifuge. J. phys. Chem.65, 1138 (1961).
Schildkraut, C. L., Marmur, J., Doty, P.: Determination of the base composition of deoxyribonucleic acid from its buoyant density in CsCl. J. molec. Biol.4, 430 (1962).
Vinograd, J., Bruner, R., Kent, R., Weigle, J.: Band-centrifugation of macro-molecules and viruses in self-generating density gradients. Proc. nat. Acad. Sci. (Wash.)49, 902 (1963).
Studier, F. W.: Sedimentation studies of the size and shape of DNA. J. molec. Biol.11, 373 (1965).
Freifelder, D.: Molecular weights of coliphages and coliphage DNA. IV. Molecular weights of DNA bacteriophages T4, T5 and T7 and the general problem of determination of M. J. molec. Biol.54, 567 (1970).
Mandel, M., Igambi, L., Bergendahl, J., Dodson, M. L., Jr., Scheltgen, E.: Correlation of melting temperature and cesium chloride buoyant density of bacterial deoxyribonucleic acid. J. Bact.101, 333 (1970).
Horvath, C. G., Preis, B. A., Lipsky, S. G.: Fast liquid chromatography: An investigation of operating parameters and the separation of nucleotides on pellicular ion exchanges. Analyt. Chem.39, 1422 (1967).
Gillespie, D., Spiegelman, S.: Quantitative assay for DNA-RNA hybrids with DNA immobilized on a membrane. J. molec. Biol.12, 829 (1965).
Richards, O. C.: Hybridization of Euglena gracilis chloroplast and nuclear DNA Proc. nat. Acad. Sci. (Wash.)57, 156 (1967).
McConaughy, B. L., McCarthy, B. J.: Related base sequences in the DNA of simple and complex organisms. V. The specificity of interactions between oligonucleotides and denatured DNA. Biochem. Genet.4, 409 (1970).
Weissman, C., Borst, P., Curdon, R. H., Billeter, M. A., O'choa, S.: Replication of viral RNA. III. Doublestranded replicative form of MS 2 phage RNA Proc. nat. Acad. Sci. (Wash.)51, 682 (1964).
Ludwig, H., Biswal, N., Benyesh-Melnick, M.: DNA-DNA hybridization studies with nucleic acids of herpes simplex virus type 1, type 2 and pseudo-rabiea virus. Virology (im Druck).
—, Haines, H. G., Biswal, N., Benyesh-Melnick, M.: The characterization of Varicella-Zoster virus DNA. J. gen. Virol.14, 111 (1972).
Pertoft, H.: Density gradient centrifugation of a herpes virus (IBR V) in colloidal silica. Virology41, 368 (1970).
Wildy, P., Russel, W. C., Horne, R. W.: The morphology of herpes virus. Virology12, 204 (1960).
Almeida, J. P., Howatson, A. F., Williams, M. G.: Morphology of Varicella (chicken pox) virus. Virology16, 353 (1962).
Abodeely, R. A., Lawson, L. A., Randall, Ch. C.: Morphology and entry of enveloped and deenveloped equine abortion (herpes) virus. J. Virol.5, 513 (1970).
Marmur, J.: A procedure for the isolation of DNA from microorganisms. J. molec. Biol.3, 208 (1961).
Morrison, J. M., Keir, H. M.: A new DNA-exonuclease in cells infected with herpes virus: Partial purification and properties of the enzyme. J. gen. Virol.3, 337 (1968).
Solymosy, F., Hüvös, P., Gulyás, A., Kapovits, I., Gaál, Ö, Bagi, G., Farkas, G. L.: Diethyl pyrocarbonate, a new tool in the chemical modification of nucleic acids? Biochim. biophys. Acta (Amst.)238, 406 (1971).
Marmur, J., Doty, P.: Determination of the base composition of DNA from its thermal denaturation temperature. J. molec. Biol.5, 109 (1962).
Weller, T. H., Witton, H. M., Bell, E. J.: The etiologio agents of varicella and herpes zoster. Isolation, propagation, and cultural characteristics in vitro. J. exp. Med.108, 843 (1958).
Melnick, J. L., Midulla, M., Wimberly, I., Barrera-Oro, J. G., Levy, B. M.: A new member of the herpesvirus group isolated from South American marmosets. J. Immunol.92, 596 (1964).
Plummer, G., Goodheart, C. R., Henson, D., Bowling, C. P.: A comparative study of the DNA density and behavior in tissue cultures of fourteen different herpesviruses. Virology38, 134 (1969).
Crawford, L. V., Lee, A. J.: The nucleic acid of human cytomegalovirus. Virology23, 105 (1964).
Graham, B. J., Minamishima, Y., Dreesman, G. R., Haines, H. G., Benyesh-Melnick, M.: Complement-requiring neutralizing (CRN) antibodies in hyper-immune sera to human cytomegaloviruses. J. Immunol.107, 1618 (1971).
Haines, H. G., Von Essen, R., Benyesh-Melnick, M.: Preparation of specific antisera to cytomegaloviruses in goats. Proc. Soc. exp. Biol. (N.Y.)138, 846 (1971).
Schneweis, K. E.: Serologische Untersuchungen zur Typendifferenzierung des Herpesvirus hominis. Z. Immunitätsforsch.124, 24 (1962).
Plummer, G., Waner, J. L., Bowling, C. P.: Comparative studies of type 1 and type 2 “herpes simplex” viruses. Brit. J. exp. Path.49, 202 (1968).
Nahmias, A. J., Dowdle, W. R.: Antigenic and biologic differences in herpes-virus hominis. Progr. med. Virol.10, 110 (1968).
Ejercito, P. M., Kieff, E. D., Roizman, B.: Characterization of herpes simplex virus strains differing in their effect on social behavior of infected cells. J. gen. Virol.3, 357 (1968).
Goodheart, C. R., Plummer, G., Waner, J. L.: Density difference of DNA of human herpes simplex viruses, types 1 and 2. Virology35, 473 (1968).
Graham, B., Ludwig, H., Bronson, D., Benyesh-Melnick, M., Biswal, N.: Physicochemical properties of the DNA of various herpesviruses. Bact. Proc. 170 (1971).
Kieff, E. D., Bachenheimer, S. L., Roizman, B.: Size, composition, and structure of the deoxyribonucleic acid of herpes simplex virus subtypes 1 and 2. J. Virol.8, 125 (1971).
Bryans, J. T.: The herpesviruses in disease of the horse. Proc. Amer. Ass. Equine Pract. 119 (1968).
Plummer, G., Bowling, C. P., Goodheart, C. R.: Comparison of four horse herpesviruses. J. Virol.4, 738 (1969).
Bryans, J. T., Rogers, P., McCollum, W. H., Ludwig, H.: Isolation and characterization of a herpesvirus from an exanthematous progenital disease of the horse. Bacteriol. Proc. 171 (1971).
Mayr, A., Böhm, H. O., Brill, J., Woyciechowska, S.: Charakterisierung eines Stutenabortvirus aus Polen und Vergleich mit bekannten Rhinopneumonitis-virus-Stämmen des Pferdes. Arch. ges. Virusforsch.17, 216 (1965).
Kit, S.: Equilibrium sedimentation in density gradients of DNA preparations from animal tissues. J. Mol. Biol.3, 711 (1961).
Coudray, Y., Quetier, F., Guille, E.: New compilation of satellite DNA's. Biochim. Biophys. Acta217, 259 (1970).
Gillespie, J. H., McEntee, K., Kendrick, J. W., Wagner, W. C.: Comparison of infectious pustular vulvo-vaginitis virus with infectious bovine rhinotracheitis virus. Cornell Vet.49, 288 (1959).
McKercher, D. G.: A comparison of the viruses of infectious bovine rhinotracheitis (IBR), infectious pustular vulvovaginitis (IPV) and rinderpest. Can. J. Comp. Med. Vet. Sci.28, 77 (1964).
Bowling, C. P., Goodheart, C. R., Plummer, G.: Oral and genital bovine herpesviruses. J. Virol.3, 95 (1969).
Russel, W. C., Crawford, L. V.: Properties of the nucleic acids from some herpes group viruses. Virology22, 288 (1964).
Erikson, R. L., Szybalski, W.: The Cs2SO4 equilibrium density gradient and its application for the study of T-even phage DNA: glucosylation and replication. Virology22, 111 (1964).
Wagner, E. K., Roizman, B., Savage, T., Spear, P. G., Mizell, M., Durr, F. E., Sypowicz, D.: Characterization of the DNA of herpesviruses associated with Lucké adenocarcinoma of the frog and Burkitt lymphoma of man. Virology42, 257 (1970).
Lee, L. F., Roizman, B., Spear, P. G., Kieft, E. D., Burmester, B. R., Nazerian, K.: Marek's Disease herpes virus: A cytomegalovirus? Proc. nat. Acad, Sci. (N.Y.)64, 951 (1969).
—, Kieff, E. D., Bachenheimer, S. L., Roizman, B., Spear, P. G., Burmester, B. R., Nazerian, K.: Size and composition of Marek's Disease virus deoxyribonucleic acid. J. Virol.7, 289 (1971).
Soehner, R. L., Gentry, G. A., Randell, C. C.: Some physicochemical characteristics of equine abortion virus nucleic acid. Virology26, 394 (1965).
Plummer, G., Waterson, A. P.: Equine herpesviruses. Virology19, 412 (1963).
Karpas, A.: Characterization of a new herpes-like virus isolate from foal-kidney. Ann. Inst. Pasteur110, 688 (1966).
Hsiung, G. D., Fischman, H. R., Fong, C. K. Y., Green, R. H.: Characterization of a cytomegalo-like virus isolated from spontaneously degenerated equine kidney culture. Proc. Soc. exp. Biol. (N.Y.)130, 80 (1969).
Weinberg, A., Becker, Y.: Studies on EB virus of Burkitt's lymphoblasts. Virology39, 312 (1969).
Schulte-Holthausen, H., Zur Hausen, H.: Partial purification of the Epstein-Barr virus and some properties of its DNA. Virology40, 776 (1970).
Roizman, B.: The herpesviruses — a biochemical definition of the group. Curr. Top. in Microbiol. and Immunol.49, 1 (1969).
Martin, W. B., Hay, D., Crawford, L. V., LeBouvier, G. L., Crawford, M. E.: Characteristics of bovine mammillitis virus. J. gen. Microbiol.46, 325 (1966).
Kaplan, A. S., Ben-Porat, T.: Mode of replication of pseudorabies virus DNA. Virology23, 90 (1964).
Becker, Y., Pym, H., Sarov, I.: Herpes simplex virus DNA. Virology36, 184 (1968).
Kaplan, A. S.: Herpes simplex and pseudorabies viruses. Virology Monographs, vol. 5. Berlin-Heidelberg-New York: Springer 1969.
Russel, W. C., Crawford, L. V.: Some characteristics of the deoxyribonucleic acid from herpes simplex virus. Virology21, 353 (1963).
Ben-Porat, T., Kaplan, A. S.: The chemical composition of herpes simplex and pseudorabies viruses. Virology16, 261 (1962).
Cowie, D. B., Avery, R. J., Champe, S. P.: DNA homology among T-even bacteriophages. Virology45, 30 (1971).
Fujinaga, K., Piña, M., Green, M.: The mechanism of viral carcinogenesis by DNA mammalian viruses. VI. A new class of virus-specific RNA molecules in cells transformed by group C human adenoviruses. Proc. nat. Acad. Sci. (Wash.)64, 255 (1969).
Scholtissek, C., Rott, R.: Hybridization studies with influenza virus RNA. Virology39, 400 (1969).
Walker, P. M. B., McLaren, A.: Specific duplex formation in vitro of mammalian DNA. J. molec. Biol.12, 394 (1965).
Aloni, Y., Winocour, E., Sachs, L., Torten, J.: Hybridization between SV 40 DNA and cellular DNA's. J. molec. Biol.44, 333 (1969).
Zur Hausen, H., Schulte-Holthausen, H.: Presence of EB virus nucleic acid homology in a “virus free” line of Burkitt tumor cells. Nature227, 245 (1970).
Jacquemont, B., Richard, M. H., Grange, J.: Failure to detect homology between the DNA of the Shope fibroma virus and the DNA of the sensitive cell. J. gen. Virol.10, 237 (1971).
McCarthy, B. J., Bolton, E. T.: An approach to the measurement of genetic relatedness among organisms. Proc. nat. Acad. Sci. (Wash.)50, 156 (1963).
Wagner, E. K., Roizman, B.: Ribonucleic acid synthesis in cells infected with herpes simplex virus I. Patterns of ribonucleic acid synthesis in productively infected cells. J. Virol.4, 36 (1969).
Crothers, D. M.: Calculation of melting curves for DNA. Biopolymers6, 1391 (1968).
Green, M.: Chemical composition of animal viruses. In: The biochemistry of Viruses. H. B. Levy, ed. New York: Marcel Dekker 1969.
Roizman, B., Keller, J. M., Spear, P. G., Terni, M., Nahmias, A., Dowdle, W.: Variability, structural glycoproteins, and classification of herpes simplex viruses. Nature (Lond.)227, 1253 (1970).
Bronson, D. L., Graham, B. J., Ludwig, H., Benyesh-Melnick, M., Biswal, N.: Studies on the relatedness of herpes-viruses through DNA-RNA hybridization. Biochim. biophys. Acta (Amst.)259, 24 (1972).
Subak-Sharpe, H., Bürk, R. R., Crawford, L. V., Morrison, J. M., Hay, J., Keir, H. M.: An approach to evolutionary relationships of mammalian DNA viruses through analysis of the pattern of nearest neighbor base sequences. Cold Spr. Harb. Symp. quant. Biol.31, 737 (1966).
Knippers, R.: Molekulare Genetik. Stuttgart: G. Thieme 1971.
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Der experimentelle Teil der Arbeit wurde am Department of Virology and Epidemiology, Baylor College of Medicine, Houston (Texas), durchgeführt.
Herrn Prof. Dr. J. L. Melnick, Frau Prof. Dr. M. Benyesh-Melnick und Herrn Dr. N. Biswal bin ich für die menschliche und wissenschaftliche Unterstützung während meines Aufenthaltes (1969–1971) am Department of Virology and Epidemiology, Baylor College of Medicine, Houston, Texas, zu großem Dank verpflichtet.
Für die stete Förderung meiner Arbeiten gilt mein besonderer Dank den Herren Prof. Dr. R. Rott und Prof. Dr. C. Scholtissek.
Die Arbeit wurde aus Mitteln des “Special Virus Cancer Program of the National Cancer Institute, NIH” sowie mit einem Stipendium der Deutschen Forschungsgemeinschaft gefördert.
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Ludwig, H. Untersuchungen am genetischen Material von Herpesviren. Med Microbiol Immunol 157, 212–238 (1972). https://doi.org/10.1007/BF02121162
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DOI: https://doi.org/10.1007/BF02121162