Before revision: Second, GNC code evolved to SNS primeval genetic codes involving 16 codons (GGC, GGG, GCC, GCG, GAC, GAG, GUC, GUG, CUC, GUG, CCC, CCG, CAC, CAG, CGC and CGG), which code 10 amino acides (glycine, alanine, aspartic acid, valine, glutamic acid, leucine, proline, histidine, glutamine, arginine).
After revision: Second, GNC code evolved to SNS primeval genetic codes involving 16 codons (GGC, GGG, GCC, GCG, GAC, GAG, GUC, GUG, CUC, GUG, CCC, CCG, CAC, CAG, CGC and CGG), which code 10 amino acids (glycine, alanine, aspartic acid, valine, glutamic acid, leucine, proline, histidine, glutamine, arginine).