1. Mitotic chiasmata, gene density, and oncogenes

   • Evelyn M. Kuhn
   • Eeva Therman
   • C. Denniston

   Original Investigations Pages: 1 - 5

2. δ-Aminolevulinate dehydratase: Induced expression and regional assignment of the human gene to chromosome 9q13»qter

   • A. -L. Wang
   • K. H. Astrin
   • R. J. Desnick

   Original Investigations Pages: 6 - 10

3. Maternal age-specific rates of numerical chromosome abnormalities with special reference to trisomy

   • T. Hassold
   • D. Chiu

   Original Investigations Pages: 11 - 17

4. Chromosomes of human sperm: Variability among normal individuals

   • B. Brandriff
   • L. Gordon
   • A. V. Carrano

   Original Investigations Pages: 18 - 24

5. Two new polymorphic markers in the human proα2(1) collagen gene

   • Diana K. Brebner
   • Anne F. Grobler-Rabie
   • C. D. Boyd

   Original Investigations Pages: 25 - 27

6. Chromosomal banding patterns in human large bowel adenomas

   • Amelia Reichmann
   • Paulette Martin
   • B. Levin

   Original Investigations Pages: 28 - 31

7. Determination of α₂HS-glycoprotein phenotypes by isoelectric focusing and immunoblotting: polymorphic occurrence of HSGA ^*5 in Okinawa

   • I. Yuasa
   • T. Taira
   • K. Okada

   Original Investigations Pages: 32 - 34

8. Lethal osteogenesis imperfecta and a collagen gene deletion. Length polymorphism provides an alternative explanation

   • B. C. Sykes
   • D. J. Ogilvie
   • B. P. Wordsworth

   Original Investigations Pages: 35 - 37

9. X-linked dominant Charcot-Marie-Tooth disease: Suggestion of linkage with a cloned DNA sequence from the proximal Xq

   • A. Gal
   • J. Mücke
   • T. F. Wienker

   Original Investigations Pages: 38 - 42

10. Linkage between the loci for mitochondrial malic enzyme (ME2) and coagulation factor XIIIA subunit (F13A)

    • J. Kömpf
    • F. Schunter
    • H. Ritter

    Original Investigations Pages: 43 - 44

11. Mapping X-linked ophthalmic diseases: II. Linkage relationship of X-linked retinitis pigmentosa to X chromosomal short arm markers

    • Robert L. Nussbaum
    • Richard Alan Lewis
    • Robert Ferrell

    Original Investigations Pages: 45 - 50

12. Etiological study on isolated esophageal atresia

    • Tünde Szendrey
    • Gy. Danyi
    • A. Czeizel

    Original Investigations Pages: 51 - 58

13. Optimising human chromosome separation for the production of chromosome-specific DNA libraries by flow sorting

    • P. Harris
    • E. Boyd
    • M. A. Ferguson-Smith

    Original Investigations Pages: 59 - 65

14. A new restriction fragment length polymorphism in the haptoglobin gene region

    • S. Oliviero
    • M. DeMarchi
    • A. O. Carbonara

    Original Investigations Pages: 66 - 70

15. Homozygosity for the variant α-L-fucosidase trait and mucolipidosis III

    • Rosanna Gatti
    • C. Lombardo
    • P. P. Cardo

    Original Investigations Pages: 71 - 73

16. Sibs of probands with neural tube defects —A study in the Federal Republic of Germany

    • Manuela Koch
    • W. Fuhrmann

    Original Investigations Pages: 74 - 79

17. Height of females with pure gonadal dysgenesis and normal male or female karyotype

    • Krzysztof Boczkowski

    Short Communications Pages: 80 - 81

18. Does X-Y pairing during male meiosis protect the paired region of the X chromosome from subsequent X-inactivation?

    • P. S. Burgoyne
    • Anne McLaren

    Short Communications Pages: 82 - 83

19. A new hereditary single band variant of the Gc system

    • I. Nakasono
    • M. Iwasaki
    • Y. Tanoue

    Short Communications Pages: 84 - 85

20. Evidence for a “new” allele at the phosphoglycolate phosphatase locus

    • J. Henke
    • H. Schweitzer
    • V. Sachs

    Short Communications Pages: 86 - 86

21. Deletion of band 13q21 is compatible with normal phenotype

    • J. Couturier
    • N. Morichon-Delvallez
    • B. Dutrillaux

    Clinical Case Report Pages: 87 - 91

22. Source of single X in XO turner syndrome: a comment

    • Patricia Tippett
    • Ruth Sanger

    Letter to the Editors Pages: 92 - 92

23. A translocation 46,XY,t(1;2)(q32;q21) in a male with reproductive failure

    • S. Kaur

    Case Observed Pages: 93 - 93

24. De novo deletion 1p(34→pter)

    • Anna Pálová
    • Edita Halasová
    • Ludovít Kádasi

    Erratum Pages: 94 - 94

25. DNA polymorphism and molecular pathology of the human globin gene clusters

    • Stylianos E. Antonarakis
    • Haig H. Kazazian Jr.
    • Stuart H. Orkin

    Erratum Pages: 95 - 99

26. Announcement

    Announcement Pages: 100 - 100