differential expression of the closely linked gamma , beta ( a ) ( or beta ( b ) ) , and beta ( c ) globin genes in sheep results in the production of fetal hemoglobin ( hb f , alpha ( 2 ) gamma ( 2 ) ) during gestation and the adult hemoglobins ( hb a , alpha ( 2 ) beta ( 2 ) ( a ) , and hb b , alpha ( 2 ) beta ( 2 ) ( b ) ) after birth .
C0015936
hb
C0019046
hb