1. Empirical support for a stochastic model of evolution

   • Richard Holmquist

   OriginalPaper Pages: 211 - 222

2. Genetic code limit organisms — do they exist?

   • Carl R. Woese
   • Michael A. Bleyman

   OriginalPaper Pages: 223 - 229

3. Characterization of the primary structural homology between the 16 S ribosomal RNAs ofEscherichia coli andBacillus megaterium by oligomer cataloging

   • Kenneth J. Pechman
   • Carl R. Woese

   OriginalPaper Pages: 230 - 240

4. Polyphosphate and trimetaphosphate formation under potentially prebiotic conditions

   • R. Osterberg
   • L. E. Orgel

   OriginalPaper Pages: 241 - 248

5. Studies in prebiotic synthesis. VII

   • W. D. Fuller
   • R. A. Sanchez
   • L. E. Orgel

   OriginalPaper Pages: 249 - 257

6. The calcitonins: An example of unusual evolution

   • Matthys Staehelin

   OriginalPaper Pages: 258 - 262

7. Formation of urea and guanidine by irradiation of ammonium cyanide

   • R. Lohrmann

   OriginalPaper Pages: 263 - 269

8. The possible conservation of genetic information in repetitious sequences of DNA

   • Zhores A. Medvedev

   Letter to the Editor Pages: 270 - 272

9. Recently published protein sequences. I

   • Thomas H. Jukes
   • Richard Holmquist

   Letter to the Editor Pages: 273 - 290

10. Urea as a probiotic signature

    • Gary Steinman

    Letter to the Editor Pages: 291 - 294

11. Katchalsky fellowship announced

    OriginalPaper Pages: 295 - 295