1. Editorial help

   EditorialNotes Pages: 205 - 205

2. Pairing of X and Y chromosomes, non-inactivation of X-linked genes, and the maleness factor

   • Paul E. Polani

   Review Articles Pages: 207 - 211

3. Assignment of human uroporphyrinogen I synthase locus to region 11qter by gene dosage effect

   • H. de Verneuil
   • N. Phung
   • M. O. Rethoré

   Original Investigations Pages: 212 - 213

4. Sister chromatid exchanges in leukocytes of patients with cancer of cervix uteri

   • A. B. Mitra
   • V. V. V. S. Murty
   • U. K. Luthra

   Original Investigations Pages: 214 - 215

5. Heterogeneity of “Mediterranean type” glucose-6-phosphate dehydrogenase (G6PD) deficiency in Spain and description of two new variants associated with favism

   • J. L. Vives Corrons
   • A. Pujades

   Original Investigations Pages: 216 - 221

6. The mendelian inheritance of a human X chromosome-specific DNA sequence polymorphism and its use in linkage studies of genetic disease

   • Marion E. E. Hill
   • Kay E. Davies
   • Robert Williamson

   Original Investigations Pages: 222 - 226

7. Regional mapping of the locus for hexokinase-1 (HK1) to 10p11→q23 by gene dosage in human fibroblasts

   • Barbara J. Gitelman
   • Nancy E. Simpson

   Original Investigations Pages: 227 - 229

8. Familial neurofibromatosis and juvenile chronic myelogenous leukemia

   • Robin D. Clark
   • John J. Hutter Jr.

   Original Investigations Pages: 230 - 232

9. Higher inductions of twin and single sister chromatid exchanges by cross-linking agents in Fanconi's anemia cells

   • Yoshio Kano
   • Yoshisada Fujiwara

   Original Investigations Pages: 233 - 238

10. Quantitative studies on the arrangement of human metaphase chromosomes

    • C. Wollenberg
    • M. P. Kiefaber
    • K. D. Zang

    Original Investigations Pages: 239 - 248

11. The central localization of the small and early replicating chromosomes in human diploid metaphase figures

    • Luc Hens
    • Micheline Kirsch-Volders
    • Charles Susanne

    Original Investigations Pages: 249 - 256

12. The cincinnati lipid research clinic family study: Familial determinants of plasma uric acid

    • D. C. Rao
    • P. M. Laskarzewski
    • C. J. Glueck

    Original Investigations Pages: 257 - 261

13. Flow cytometric characterization of a Chinese hamster x man hybrid cell line retaining the human Y chromosome

    • C. Cremer
    • J. W. Gray
    • H. H. Ropers

    Original Investigations Pages: 262 - 266

14. Distal 19q duplication

    • Jonathan Zonana
    • Michael G. Brown
    • R. Ellen Magenis

    Original Investigations Pages: 267 - 270

15. Segregation analysis of α-L-fucosidase activity

    • L. Iselius
    • J. R. Playfer
    • D. A. Price Evans

    Original Investigations Pages: 271 - 273

16. Homologous early replication patterns of the distal short arms of prometaphasic X and Y chromosomes

    • Ulrich Müller
    • Werner Schempp

    Short Communications Pages: 274 - 275

17. Confirmation of regional assignment of gene for human esterase-D to chromosome band 13q14

    • J. J. Hoo
    • Manuela Koch
    • I. Nishigaki

    Short Communications Pages: 276 - 277

18. Replication pattern in XXY cells with fra(X)

    • Ursula Froster-Iskenius
    • E. Schwinger
    • Christa Fonatsch

    Short Communications Pages: 278 - 280

19. Direct versus cultured preparation of bone marrow cells from 22 patients with acute myeloid leukemia

    • Peter H. Fitzgerald
    • Christine M. Morris
    • Lynette M. Giles

    Short Communications Pages: 281 - 283

20. Absence of linkage between the serum cholinesterase (CHE1) and rhesus (RH) loci

    • S. L. Primo-Parmo
    • E. A. Chautard-Freire-Maia

    Short Communications Pages: 284 - 286

21. A simplified procedure for haptoglobin subtyping

    • Claudio Santoro
    • Cleide Boccazzi
    • Angelo O. Carbonara

    Short Communications Pages: 287 - 288

22. The genetic polymorphism of Δ-aminolevulinate dehydrase in Italy

    • R. Petrucci
    • A. Leonardi
    • G. Battistuzzi

    Short Communications Pages: 289 - 290

23. Cytogenetic abnormalities in a patient with hypercalcemia and papillary thyroid carcinoma

    • S. Pathak
    • T. C. Hsu
    • Robert C. Hickey

    Clinical Case Reports Pages: 291 - 293

24. Extra band in the 9qh+ chromosome in a normal father and in his child with multiple congenital anomalies

    • M. Cirillo Silengo
    • G. F. Davi
    • P. Franceschini

    Cases Observed Pages: 294 - 294

25. Failure to detect polycystic kidneys in utero by second trimester ultrasonography

    • Joe Leigh Simpson
    • Rudy E. Sabbagha
    • Ralph K. Tamura

    Cases Observed Pages: 295 - 295

26. 46,XY/47,XY,+17 mosaicism in a newborn with severe malformations

    • J. Bullerdiek
    • S. Bartnitzke

    Cases Observed Pages: 296 - 296

27. Five cases of prenatally detected true mosaic trisomy 20

    • G. Barbi
    • M. Djalali
    • P. Steinbach

    Cases Observed Pages: 297 - 297

28. Letter to the editors

    • Arne Brun
    • Karl-Henrik Gustavson

    Letter Pages: 298 - 298

29. First announcement

    Announcement Pages: 299 - 299

30. Erratum

    • E. Wunder
    • U. Burghardt
    • L. Hamilton

    Erratum Pages: 300 - 300

31. Erratum

    • P. C. Huang
    • R. B. Sheridan III

    Erratum Pages: 300 - 300