1. Direct selection of mutants restricting efficiency of suppression and misreading levels inE. coli B

   • Dirk Elseviers
   • Luigi Gorini

   OriginalPaper Pages: 277 - 287

2. Regulatedin vitro synthesis of the enzymes of thedeo operon ofEscerichia coli

   • Bo Ahlquist Svenningsen

   OriginalPaper Pages: 289 - 304

3. Cryptic mutations: Their predicted biochemical basis, frequencies and effects on gene conversion

   • B. C. Lamb

   OriginalPaper Pages: 305 - 314

4. Effect of m₃ gene on the development of phage P22

   • Sushil Taneja
   • P. S. Khandekar
   • Maharani Chakravorty

   OriginalPaper Pages: 315 - 326

5. Multiple regulation of nucleoside catabolizing enzymes: Regulation of thedeo operon by thecytR anddeoR gene products

   • Karin Hammer-Jespersen
   • Agnete Munch-Petersen

   OriginalPaper Pages: 327 - 335

6. Studies on the size of the diploid region inBacillus subtilis merozygotes from strains carrying thetrpE26 mutation

   • C. Audit
   • C. Anagnostopoulos

   OriginalPaper Pages: 337 - 351

7. Studies on the mechanism of electron transport in thebc ₁-segment of the respiratory chain in yeast

   • Bernd Lang
   • Gertraud Burger
   • Fritz Kaudewitz

   OriginalPaper Pages: 353 - 363

8. Two separated nucleolus organizers on theDrosophila hydei Y chromosome

   • Ulrich Schäfer
   • Werner Kunz

   Short Communication Pages: 365 - 368