title: A harmonic structure of the genetic code.
abstract: In this paper is presented a new, very harmonic structure of the genetic code (GC) within a system of "4 x 5" (and/or of "5 x 4") of amino acids (AAs) in two variants. In first variant, the five rows within the system start with one polar charged amino acid (AA) each, making first column, consisting from five polar charged AAs (D, R, K, H, E). Five polar non-charged AAs (N, P, Y, W, Q) follow, then five non-polar AAs as last column (A, L, F, V, I) and, finally, five polar or non-polar AAs, in a combination, as first to last column (A as non-polar; S, T as polar, and G, P as ambivalent AAs). A second variant is subsequent to this one-"4 x 5" system with five nitrogen AAs (K, R, P, H, W), five oxygen (D, E, Y, S, T), five solely carbon (A, L, F, V, I) and five "combined" AAs (G with hydrogen as side chain; C and M with carbon and sulfur; N and Q with carbon, oxygen and nitrogen). A strict balance of atom and nucleon number as well as molecule mass follows the classification in both system variants.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Nis, Cirila i Metodija 2, Serbia & Montenegro, Yugoslavia. m.m.r@eunet.yu
authors.forename: Miloje M
authors.initials: MM
authors.lastname: Rakocević
mesh_terms: D000596:Amino Acids; D000818:Animals; D005815:Genetic Code; D008957:Models, Genetic; D013598:Systems Theory
chemical_list: D000596:Amino Acids