title: Evaluation of the non-randomness of protein compositions.
abstract: A method is described for assessing the non-randomness of protein compositions, based on the chi-squared statistic for the differences between the observed numbers of residues of each type and the numbers expected for a random distribution of codons. The analysis indicates that changes in at least 30% of the residues in natural proteins are selected against.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D003062:Codon; D011336:Probability; D011506:Proteins / Q000032:analysis / Q000235:genetics
chemical_list: D000596:Amino Acids; D003062:Codon; D011506:Proteins