1. Sequence organization of animal nuclear DNA

   • J. Schmidtke
   • J. T. Epplen

   Review Articles Pages: 1 - 18

2. The fragile site on chromosome 16 (q21q22)

   • F. Shabtai
   • S. Bichacho
   • I. Halbrecht

   Original Investigations Pages: 19 - 22

3. Evolution of chromosomal abnormalities in sequential cytogenetic studies of ataxia telangiectasia

   • A. Al Saadi
   • M. Palutke
   • G. Krishna Kumar

   Original Investigations Pages: 23 - 29

4. Trisomy 8

   • Ann C. Chandley
   • T. B. Hargreave
   • W. H. Price

   Original Investigations Pages: 31 - 38

5. Y-to-X chromosome translocation observed in two generations

   • H. O. Åkesson
   • B. Hagberg
   • J. Wahlström

   Original Investigations Pages: 39 - 42

6. Heart-hand syndrome

   • S. Ruiz de la Fuente
   • F. Prieto

   Original Investigations Pages: 43 - 47

7. On the inadequacy of quinquennial data for analyzing the paternal age effect on Down's dyndrome rates

   • S. H. Lamson
   • P. K. Cross
   • R. Regal

   Original Investigations Pages: 49 - 51

8. Chromosome studies on lymphocytes of patients under cytostatic therapy

   • E. Gebhart
   • L. Lösing
   • F. Wopfner

   Original Investigations Pages: 53 - 63

9. A case of r(21) with stigmata of atypical Down syndrome

   • Atsushi Ieshima
   • Nobuaki Ogasawara
   • Yoshikazu Kuroki

   Original Investigations Pages: 65 - 69

10. Gc X and Gc Y revealed by immunofixation electrophoresis

    • Kerstin Hjalmarsson

    Original Investigations Pages: 71 - 74

11. A new approach in the evaluation of chromosome variants in man

    • J. Azumi
    • Y. Nakagome
    • E. Matsunaga

    Original Investigations Pages: 75 - 79

12. Cytogenetic evidence for the absence of an inactivated X chromosome in a human female (XX) breast carcinoma cell line

    • M. Camargo
    • Nancy Wang

    Original Investigations Pages: 81 - 85

13. Anatomic and chromosomal anomalies in 639 spontaneous abortuses

    • T. Kajii
    • A. Ferrier
    • Sugandhi Avirachan

    Original Investigations Pages: 87 - 98

14. Dihydropteridine reductase variation in man and the characid fish “Cheirodon axelrodi”: Evidence for a dimeric enzyme structure

    • P. Kuhl
    • K. Olek
    • P. Wardenbach

    Original Investigations Pages: 99 - 102

15. Biochemical, psychometric, and neuropsychological studies in heterozygotes for various lipidoses

    • H. Christomanou
    • J. Martinius
    • C. Förster

    Original Investigations Pages: 103 - 110

16. A new procedure for the determination of transferrin^C (Tf^C) subtypes by isoelectric focusing

    • J. Constans
    • P. Kühnl
    • W. Spielmann

    Original Investigations Pages: 111 - 114

17. Satellite associations and NOR staining in mitoses of trisomy 21 mosaicism

    • H. Zankl
    • H. Nagl

    Short Communications Pages: 115 - 117

18. Pi ^M4: An additional Pi ^M subtype

    • J. Constans
    • M. Viau
    • C. Gouaillard

    Short Communications Pages: 119 - 121

19. G6PD deficiency in senile cataracts

    • V. Panich
    • S. Na-Nakorn

    Short Communications Pages: 123 - 124

20. Gd(-) Rennes a new deficient variant of glucose-6-phosphate dehydrogenase associated with congenital nonspherocytic hemolytic anemia found in France

    • C. Picat
    • J. Etiemble
    • P. -Y. Le Prise

    Short Communications Pages: 125 - 127

21. Venous thromboembolism and AB0 blood groups in a Brazilian population

    • Wanyce Miriam Robinson
    • Israel Roisenberg

    Short Communications Pages: 129 - 131

22. G6PD ciudad de la habana: A new slow variant with deficiency found in a cuban family

    • R. González
    • M. Estrada
    • A. Gutierrez

    Short Communications Pages: 133 - 135

23. 13/14 translocation in a man with reproductive failure

    • Miroslava D. Mićić
    • Jovanka G. Nikoliš
    • Sava R. Mićić

    Clinical Case Reports Pages: 137 - 139

24. Clinical consequences of Xp-

    • J. Egozcue

    Letters to the Editors Pages: 141 - 142

25. Announcements

    Announcement Pages: 143 - 143