1. Abnormal X chromosomes in man: Origin, behavior and effects

   • Eeva Therman
   • Klaus Pätau

   Reviews Pages: 1 - 16

2. Supernumerary small ring chromosome

   • J. J. Hoo
   • Claudia Förster
   • Susane Hansen

   Original Investigations Pages: 17 - 28

3. Etude chromosomique chez les parents d'enfants trisomiques 21. Associations entre chromosomes acrocentriques

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

   Travaux Originaux Pages: 29 - 48

4. Observations with G banding of human chromosomes

   • J. -U. Walther
   • S. Stengel-Rutkowski
   • J. -D. Murken

   Short Communications Pages: 49 - 51

5. Morphogenetic disturbances in a spontaneous abortus with trisomy B

   • V. P. Kulazenko

   Short Communications Pages: 53 - 59

6. Marker chromosomes in parents of spontaneous abortuses

   • Søren Holbek
   • Ursula Friedrich
   • Aage Juhl Therkelsen

   Short Communications Pages: 61 - 64

7. A 46,XY infant with uterus, dysgenetic gonads and multiple anomalies

   • Margherita Silengo
   • Robert L. Kaufman
   • John Kissane

   Clinical Case Reports Pages: 65 - 68

8. A pericentric inversion of a chromosome 4 with a t(4q+10p-) and a familial t(DqDq) in a mentally retarded girl

   • S. W. Soukup
   • W. Yarema
   • M. Robinow

   Clinical Case Reports Pages: 69 - 78

9. Trisomy of the long arm of human chromosome 1

   • T. H. Norwood
   • H. Hoehn

   Letters to the Editors Pages: 79 - 82