Hemoglobin (haemoglobin, Hb, Hgb)
Hemoglobin (haemoglobin, Hb, Hgb). red cells in blood carry O 2 from lung to tissues by hemoglobin, a 4-subunit protein having an O 2 -binding prosthetic group, heme, that gives blood its color (Hb also carries (some) CO 2 and H + back to the lung)
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