(from the article `porphyrin`) any of a class of water-soluble, nitrogenous biological pigments (biochromes), derivatives of which include the hemoproteins (porphyrins combined ... [3 related articles] Found on http://www.britannica.com/eb/a-z/h/36
(he´mo-pro″tēn) a conjugated protein whose nonprotein portion is heme; examples include catalase, cytochrome, hemoglobin, and myoglobin. Found on http://www.encyclo.co.uk/local/21001