1. Studies on the biosynthesis of TMV

   • T. Nilsson-Tillgren

   OriginalPaper Pages: 191 - 202

2. The influence of heterochromatin, inversion-heterozygosity and somatic pairing on X-ray induced mitotic recombination in Drosophila melanogaster

   • Hans Joachim Becker

   OriginalPaper Pages: 203 - 218

3. Genetic studies of the ribosomal proteins in Escherichia coli

   • Satoshi Dekio
   • Renkichi Takata

   OriginalPaper Pages: 219 - 224

4. Etude d'une mutation très faiblement transformable au locus de la thréonine désaminase de bacillus subtilis

   • C. Jamet
   • C. Anagnostopoulos

   OriginalPaper Pages: 225 - 242

5. Studies on the functions of the RNA polymerase components by means of mutations

   • R. B. Khesin
   • Zh. M. Gorlenko
   • T. S. Ilyina

   OriginalPaper Pages: 243 - 261

6. Segregation distorter in D. melanogaster males: An effect of female genotype on recovery

   • R. E. Denell
   • B. H. Judd

   OriginalPaper Pages: 262 - 274

7. Integration defective mutants of bacteriophage P2

   • B. K. Choe

   OriginalPaper Pages: 275 - 284

8. Errata

   • G. W. Grigg

   Erratum Pages: 284 - 284