the major hemoglobin component hb a of the tuatara , sphenodon punctatus , a relict of the rhynochocephalian reptiles that lived 200 million years ago , was investigated in the light of the apparent contradiction inherent in an effect of organic phosphate cofactors on the oxygen affinity of hemoglobins exhibiting hyperbolic oxygen equilibrium curves .
C0019016
hemoglobin
C0019046
hemoglobins