The deep red, nonprotein, ferrous component of hemoglobin, C34H32FeN4O4.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "heme" in a sentence
"They put a smaller structure inside it called a heme, a large flat molecule that is the active part of hemoglobin."
"This anti-inflammatory signaling agent upregulates the expression of a gene that encodes for a cell-protective substance called heme oxygenase 1 HO-1."
"The sphere in the center of the heme is an iron atom."