the putative polypeptide is 141 amino acids long , identical to that of the alpha- or zeta-globin , but its predicted amino-acid sequence is nearly as different from the orang-utan alpha-globin ( 55 differences ) as the human zeta-globin is from the human alpha-globin ( 59 differences ) , suggesting an ancient history for the theta 1-globin gene .
C0043472
zeta-globin
C0002270
alpha-globin