13. ABO Alleles (A and B Alleles)

 

Again, there are several nucleotide substitutions between A and B alleles - 4 of which result in amino acid substitutions. Those are arginine (R), glycine (G), leucine (L), and glycine (G) at codons 176, 235, 266, and 268 in A transferase, and glycine (G), serine (S), methionine (M), and alanine (A) at those codons in B transferase.

14. ABO Alleles (O Alleles)

01. ABO Blood Group System