codon varies from one amino acid to another.
phenylalanine- 2
leucine- 6
isoleucine - 3
valine, , proline, threonine, alanine, - 4 each
methionine, tryptophan - 1 each
tyrosine, histidine, gln, asn, lys, asp, glu, cys,
arginine -6
serine- 6,
glycine - 4
