1. Polymerization of amino acids under primitive earth conditions

   • Jose J. Flores
   • Cyril Ponnamperuma

   OriginalPaper Pages: 1 - 9

2. Sequence data: Magnitude and implications of some ambiguities

   • Richard Holmquist
   • Thomas H. Jukes

   OriginalPaper Pages: 10 - 16

3. De novo origin of periodic proteins

   • Martynas Yčas

   OriginalPaper Pages: 17 - 27

4. A systematist looks at cytochromec

   • R. A. Crowson

   OriginalPaper Pages: 28 - 37

5. Is there a physical chemical basis for the present genetic code?

   • M. Raszka
   • M. Mandel

   OriginalPaper Pages: 38 - 43

6. Base composition of ribosomal RNA and evolution

   • Pedro A. Lava-Sanchez
   • Francesco Amaldi
   • Alessandro La Posta

   OriginalPaper Pages: 44 - 55

7. Probable evolutionary mechanism underlying octanol dehydrogenase isozyme patterns in the genus drosophila

   • Sarah Bedichek Pipkin
   • Gilbert O. Ogonji
   • Olajide O. Agbede

   OriginalPaper Pages: 56 - 71

8. Comparison of frog albumins with those of other vertebrates

   • Donald G. Wallace
   • Allan C. Wilson

   OriginalPaper Pages: 72 - 86

9. On the stochastic model for estimation of mutational distance between homologous proteins

   • Motoo Kimura
   • Tomoko Ohta

   Letter to the Editor Pages: 87 - 90