Heme is a coordination complex consisting of a porphyrin ring surrounding a single ferrous (Fe 2+) or ferric (Fe 3+) ion, able to bond with diatomic oxygen and transport it around the body. Four heme ...

Heme, the iron-holding molecule that gives blood its red color, is essential for life. Yet, ironically, it can be quite toxic if not properly handled. In fact, numerous diseases – from various cancers ...