Definitions for HB
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Princeton's WordNet
hemoglobin, haemoglobin, Hb(noun)
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"
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"HB." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/HB>.

