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Noun1.hematohiston - a colorless protein obtained by removing heme from hemoglobin; the oxygen carrying compound in red blood cells
simple protein - a protein that yields only amino acids when hydrolyzed
haemoglobin, Hb, hemoglobin - a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues; "fish have simpler hemoglobin than mammals"