Functional non-equivalence of   and   hemes in human hemoglobins.
D006418:Heme / Q000502:physiology*; D006454:Hemoglobins / Q000502:physiology*; D006455:Hemoglobins, Abnormal / Q000032:analysis; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D013329:Structure-Activity Relationship
D006454:Hemoglobins; D006455:Hemoglobins, Abnormal; D006418:Heme