Poroĭkov V V, Esipova N G, Tumanian V G
Biofizika. 1976 May-Jun;21(3):397-400.
It is shown that the distribution of identical amino acid residues in the primary structure of 83 non-homologous proteins containing about 14 000 amino acids is near to a casual one, i.e. it is determined by the amino acid composition. A characteristic feature of such distribution is an increased probability of a common grouping of amino acid residues.