1. Variable substructure in the secondary constriction of the human chromosome 1

   • J. Sigmund
   • S. Schwarz

   Original Investigations Pages: 1 - 4

2. A homozygote for a serum albumin variant of the fast type

   • G. Vanzetti
   • F. Porta
   • M. Fraccaro

   Original Investigations Pages: 5 - 9

3. A two-year-old patient with an atypical expression of G_M1-β-galactosidase deficiency: Biochemical, immunological, and cell genetic studies

   • A. J. J. Reuser
   • G. Andria
   • D. Halley

   Original Investigations Pages: 11 - 19

4. Langer type of mesomelic dwarfism as the possible homozygous expression of dyschondrosteosis

   • J. P. Fryns
   • H. Van Den Berghe

   Original Investigations Pages: 21 - 27

5. Partial trisomy 10q

   • Johanna M. Klep-de Pater
   • Jan B. Bijlsma
   • Jan O. van Hemel

   Original Investigations Pages: 29 - 40

6. Biochemical characteristics of Ehlers-Danlos syndrome type VI in a family with one affected infant

   • T. Krieg
   • Ursula Feldmann
   • P. K. Müller

   Original Investigations Pages: 41 - 49

7. Effects of various cyclophosphamide concentrations in vivo on sister chromatid exchanges (SCE) and chromosome aberrations of Chinese hamster bone marrow cells

   • G. Roszinsky-Köcher
   • G. Röhrborn

   Original Investigations Pages: 51 - 55

8. Sister chromatid exchanges and aging

   • Edward L. Schneider
   • Brian Gilman

   Original Investigations Pages: 57 - 63

9. Serum zinc levels in heterozygous carriers of the gene for acrodermatitis enteropathica

   • P. Ølholm-Larsen

   Original Investigations Pages: 65 - 74

10. Cytological analyses of a 14p+variant by means of N-banding and combinations of silver staining and chromosome bandings

    • Y. F. Lau
    • W. Wertelecki
    • F. E. Arrighi

    Original Investigations Pages: 75 - 82

11. Isoelectric focusing of rare transferrin (Tf) variants and common Tf^C subtypes

    • P. Kühnl
    • W. Spielmann
    • W. Weber

    Original Investigations Pages: 83 - 87

12. Isoelectrofocusing of erythrocyte galactose 1 phospho uridyl transferase in a family with both galactosemia and duarte variants

    • F. Schapira
    • C. Gregori
    • C. Vigneron

    Original Investigations Pages: 89 - 96

13. PTC-Tasting ability in populations living in Kirghizia with special reference to hypersensitivity: Its relation to sex and age

    • A. Abraimov
    • M. M. Mirrakhimov

    Original Investigations Pages: 97 - 105

14. Origin of the extra chromosome in trisomy 21

    • J. F. Mattei
    • M. G. Mattei
    • F. Giraud

    Short Communications Pages: 107 - 110

15. A case of D₁₃ ring chromosome

    • P. Cossu
    • G. Diana
    • A. Cao

    Clinical Case Reports Pages: 111 - 114

16. Partial monosomy of the long arm of chromosome 16: A distinct clinical entity?

    • J. P. Fryns
    • J. Bande-Knops
    • H. Van Den Berghe

    Clinical Case Reports Pages: 115 - 120

17. Down's syndrome with 45 chromosomes

    • I. W. Lurie

    Clinical Case Reports Pages: 121 - 123

18. Trisomy 9p with an isochromosome of 9p

    • Brian Biederman

    Letters to the Editors Pages: 125 - 126

19. Postgraduate course in genetic red blood cell defects

    Note Pages: 127 - 127