1. Prenatal diagnosis of Sanfilippo disease type B

   • W. J. Kleijer
   • J. G. M. Huijmans
   • J. Zaremba

   Original Inverstigations Pages: 287 - 288

2. Diagnostic insonation of extra utero human placentas: No effect of lymphocytic sister chromatid exchange

   • A. Brulfert
   • V. Ciaravino
   • E. L. Carstensen

   Original Inverstigations Pages: 289 - 291

3. Regional localization of the human genes for S-adenosylhomocysteine hydrolase (cen→q131) and adenosine deaminase (q131→qter) on chromosome 20

   • T. Mohandas
   • R. S. Sparkes
   • M. S. Hershfield

   Original Inverstigations Pages: 292 - 295

4. Determination of aldehyde dehydrogenase phenotypes using hair roots: Re-examination

   • A. Yoshida

   Original Inverstigations Pages: 296 - 299

5. Genetic complementation in somatic cell hybrids of cerebroside sulfatase activator deficiency and metachromatic leukodystrophy fibroblasts

   • H. Kihara
   • Katherine K. Tsay
   • A. L. Fluharty

   Original Inverstigations Pages: 300 - 301

6. Contribution of reciprocal translocations to an understanding of chromosome displacement: Inferences for studies of spatial order at metaphase

   • Judith H. Ford
   • Cynthia G. Roberts

   Original Inverstigations Pages: 302 - 305

7. Synaptonemal complex studies in a mosaic 46,XY/47,XXY male

   • F. Vidal
   • J. Navarro
   • J. Egozcue

   Original Inverstigations Pages: 306 - 308

8. Localization of the polymorphic human calcitonin gene on chromosome 11

   • J. W. M. Höppener
   • P. H. Steenbergh
   • C. J. M. Lips

   Original Inverstigations Pages: 309 - 312

9. Chromosome 15 anomalies and the Prader-Willi syndrome: Cytogenetic analysis

   • M. G. Mattei
   • N. Souiah
   • J. F. Mattei

   Original Inverstigations Pages: 313 - 334

10. On the origin of chromosomal aberrations in human peripheral lymphocytes in vitro

    • C. Nowak
    • G. Obe

    Original Inverstigations Pages: 335 - 343

11. Heterozygous female carriers of the marker-X-chromosome: IQ estimation and replication status of fra(X)(q)

    • J. Paul
    • Ursula Froster-Iskenius
    • E. Schwinger

    Original Inverstigations Pages: 344 - 346

12. The use of cloned Y chromosome-specific DNA probes for fetal sex determination in first trimester prenatal diagnosis

    • J. R. Gosden
    • C. M. Gosden
    • C. H. Rodock

    Original Inverstigations Pages: 347 - 351

13. Red cell glutathione peroxidase (GPX1) variation in Afro-Jamaican, Asiatic Indian, and Dutch populations

    • P. Meera Khan
    • Chitralekha Verma
    • Shiela Jairaj

    Original Inverstigations Pages: 352 - 355

14. Transferrin subtypes and variants in Germany; Further evidence for a Tf null allele

    • S. Weidinger
    • H. Cleve
    • A. Görg

    Original Inverstigations Pages: 356 - 360

15. Banding of unfixed mitotic chromosomes in suspension after release from human lymphocytes and fibroblasts

    • Charles H. C. M. Buys
    • Trijntje Koerts
    • Ameke Y. van der Veen

    Short Communications Pages: 361 - 364

16. Mean corpuscular hemoglobin is increased in Martin-Bell syndrome

    • U. Langenbeck
    • J. Schmidtke
    • H. Knüppel

    Short Communications Pages: 365 - 366

17. A comparative study on steroid sulfatase and arylsulfatase C in fibroblast clones from 45,X/47,XXX and 69,XXY

    • W. Vogel
    • M. Grompe
    • S. Pentz

    Short Communications Pages: 367 - 369

18. Four cases of partial trisomy 4p by preferential segregation in a familial 4p/17q balanced translocation

    • J. del Mazo
    • F. Florit
    • J. A. Abrisqueta

    Cases Observed Pages: 370 - 370

19. HLA antigens, glyoxalase I, and esterase D in Hong Kong Chinese

    • B. R. Hawkins
    • Angela Y. Ho
    • I. F. Osmund

    Letter to the Editors Pages: 371 - 371

20. Clonal inheritance versus variability of rRNA gene activity in human fibroblasts

    • A. V. Mikelsaar
    • H. G. Schwarzacher

    Letter to the Editors Pages: 372 - 372

21. The inducible fragile site on chromosome 3

    • J. Bernar
    • S. J. Funderburk
    • R. S. Sparkes

    Letter to the Editors Pages: 373 - 373