Recently published protein sequences. I Thomas H. JukesRichard Holmquist Letter to the Editor Pages: 273 - 290
The possible conservation of genetic information in repetitious sequences of DNA Zhores A. Medvedev Letter to the Editor Pages: 270 - 272
Formation of urea and guanidine by irradiation of ammonium cyanide R. Lohrmann OriginalPaper Pages: 263 - 269
Studies in prebiotic synthesis. VII W. D. FullerR. A. SanchezL. E. Orgel OriginalPaper Pages: 249 - 257
Polyphosphate and trimetaphosphate formation under potentially prebiotic conditions R. OsterbergL. E. Orgel OriginalPaper Pages: 241 - 248
Characterization of the primary structural homology between the 16 S ribosomal RNAs ofEscherichia coli andBacillus megaterium by oligomer cataloging Kenneth J. PechmanCarl R. Woese OriginalPaper Pages: 230 - 240
Genetic code limit organisms — do they exist? Carl R. WoeseMichael A. Bleyman OriginalPaper Pages: 223 - 229
Empirical support for a stochastic model of evolution Richard Holmquist OriginalPaper Pages: 211 - 222
The partial sequence of the first 30 residues from the amino-terminus of hemoglobin B in the hagfish,Eptatretus stoutii: Homology with lamprey hemoglobin S. L. LiAusten Riggs Letter to the Editor Pages: 208 - 210
Considerations regarding the regulation of gene transcription and messenger translation Walter M. Fitch OriginalPaper Pages: 185 - 207
Phylogenetic measurement in procaryotes by primary structural characterization S. J. SoginM. L. SoginC. R. Woese OriginalPaper Pages: 173 - 184
Separate physiological roles for two isozymes of pyridine nucleotide-linked glycerol-3-phosphate dehydrogenase in chicken H. B. White IIIN. O. Kaplan OriginalPaper Pages: 158 - 172
Theoretical foundations for a quantitative approach to paleogenetics Richard Holmquist OriginalPaper Pages: 134 - 149
Theoretical foundations for a quantitative approach to paleogenetics Richard Holmquist OriginalPaper Pages: 115 - 133
On the stochastic model for estimation of mutational distance between homologous proteins Motoo KimuraTomoko Ohta Letter to the Editor Pages: 87 - 90
Comparison of frog albumins with those of other vertebrates Donald G. WallaceAllan C. Wilson OriginalPaper Pages: 72 - 86
Probable evolutionary mechanism underlying octanol dehydrogenase isozyme patterns in the genus drosophila Sarah Bedichek PipkinGilbert O. OgonjiOlajide O. Agbede OriginalPaper Pages: 56 - 71
Base composition of ribosomal RNA and evolution Pedro A. Lava-SanchezFrancesco AmaldiAlessandro La Posta OriginalPaper Pages: 44 - 55
Is there a physical chemical basis for the present genetic code? M. RaszkaM. Mandel OriginalPaper Pages: 38 - 43
Sequence data: Magnitude and implications of some ambiguities Richard HolmquistThomas H. Jukes OriginalPaper Pages: 10 - 16
Polymerization of amino acids under primitive earth conditions Jose J. FloresCyril Ponnamperuma OriginalPaper Pages: 1 - 9
Condensation of mononucleotides by imidazole J. D. IbanezA. P. KimballJ. Oró Letter to the Editor Pages: 112 - 114
Hominoid evolution as judged by fibrinopeptide structures R. F. DoolittleG. L. WoodingM. Riley OriginalPaper Pages: 74 - 83
Experimental investigation on the origin of the genetic code Carl SaxingerCyril Ponnamperuma OriginalPaper Pages: 63 - 73
The structure of cytochromec and the rates of molecular evolution Richard E. Dickerson OriginalPaper Pages: 26 - 45
On the constancy of the evolutionary rate of cistrons Tomoko OhtaMotoo Kimura OriginalPaper Pages: 18 - 25