the common pig lacks a fetal hemoglobin but has four embryonic hemoglobins : gower i ( zeta 2 epsilon 2 ) , gower ii ( alpha 2 epsilon 2 ) , heide i ( zeta 2 theta 2 ) and heide ii ( alpha 2 theta 2 ) as well as adult hb a ( alpha 2 beta 2 ) and the amino acid sequence for each of the five constituent polypeptide chains has been established .
C0015936
fetal hemoglobin
C0019046
hb