THE 3RD NUCLEOTIDE OF THE GLY CODING TRIPLET REMEMBERS THE PERIODICITY OF THE COLLAGEN CHAIN

Collagen is a fibrous protein with a primary structure with complex pe riodical features. We show using symbolic Fourier transform of the col lagen cDNA sequence that basic periodical patterns appear there also. Strikingly they are present in the third position of triplets encoding Gly, which occupies each third position in the sequence of the protei n, and to which selection on the protein level does not applied, Thus, the gene of collagen seems to appear due to pra-gene multiplication.