title: An improved method for determining codon variability in a gene and its application to the rate of fixation of mutations in evolution.
mesh_terms: D000595:Amino Acid Sequence; D005075:Biological Evolution; D003580:Cytochromes; D005815:Genetic Code; D009154:Mutation; D009711:Nucleotides
chemical_list: D003580:Cytochromes; D009711:Nucleotides