Table 2.6. Significant quantities "6 x 6" and "66" in the Genetic Code (II) Classification of amino acids according to similarity/dissimilarity of molecules classes. From (MMR, 2004, Tab. 9, p. 229): "First row (down): N-ended AAs. Second row: solely C-ended AAs. Last row (up): O-ended AAs. First to last row: remaining five AAs (one solely H-ended, two S-ended and two N-, O-ended, all five as a 'combination'. Within the cross there are only the exceptions: horizontally five the mentioned combining AAs; vertically: Y as aromatic within aliphatic AAs; G without carbon; F as aromatic within aliphatic AAs; and, finally, P as cyclic aliphatic amino acid. In the system there is a balanced proportionality as follows: within horizontal leg of the cross there are (6 x 6) ± 0 of atoms, and within vertical leg (without glycine), there are (6 x 6) ±1. Without cross: on the left there are (66) ± 0 and (66)-1 on the right." The significance and uniqueness of the quantities 36 and 66 can be seen in Surveys 1-5. (M) The AAs molecule mass. Notice that (d) is greater from (c) for exactly one modular cycle (in module 9) and that total molecules mass is equal to 2 x (37 x 37). Notice also that molecule mass within five rows is realized through the same logic-patterns of notations as the first nuclide, i.e. isotope." . And this sequence we also find in the central area of the system-arrangement presented in Figure , that is, in the central area of PSN.