EC:7.6.2.5; MetaCyc:3.6.3.41-RXN; RHEA:19261; Reactome:R-HSA-1369065 "ABCB6 transports porphyrin from cytosol to mitchondrial matrix"; Reactome:R-HSA-382560 "ABC7, mABC1 and mABC2 mediate heme transport"; Reactome:R-HSA-5683355 "Defective ABCB6 does not transport porphyrin from cytosol into mitochondria matrix"; Reactome:R-HSA-917979 "ABCG2 tetramer transports heme from cytosol to extracellular region"