1. Constraints upon the composition of supplementary DNA

   • Jane Hutchinson
   • R. K. J. Narayan
   • H. Rees

   OriginalPaper Pages: 137 - 145

2. Macronuclear DNA organization and transcription in Paramecium primaurelia

   • C. McTavish
   • J. Sommerville

   OriginalPaper Pages: 147 - 164

3. Heterochromatin variation in Cryptobothrus chrysophorus

   • Bernard John
   • Max King

   OriginalPaper Pages: 165 - 186

4. Meiotic chromosome pairing in Stethophyma grossum spermatocytes studied by a surface-spreading and silver-staining technique

   • G. H. Jones
   • B. M. N. Wallace

   OriginalPaper Pages: 187 - 201

5. End association and segregation of the achiasmatic X and Y chromosomes of the sand rat, Psammomys obesus

   • Terry Ashley
   • M. J. Moses

   OriginalPaper Pages: 203 - 210

6. Chromosomal replication in Drosophila virilis

   • M. Steinemann

   OriginalPaper Pages: 211 - 223

7. Comparison of human and mouse sperm chromatin structure by flow cytometry

   • Donald P. Evenson
   • Zbigniew Darzynkiewicz
   • Myron R. Melamed

   OriginalPaper Pages: 225 - 238

8. The 3-dimensional fine structure of the mitotic spindle in Trypanosoma cruzi

   • A. J. Solari

   OriginalPaper Pages: 239 - 255