heme biosynthetic process heme B biosynthetic process https://github.com/geneontology/go-ontology/issues/31634 MetaCyc:PWY-7766 haem B biosynthesis MetaCyc:HEME-BIOSYNTHESIS-II protoheme biosynthesis biological_process haem B biosynthetic process heme B synthesis The chemical reactions and pathways resulting in the formation of heme B, a Fe(II) porphyrin complex readily isolated from the hemoglobin of beef blood, but also found in other proteins including other hemoglobins, myoglobins, cytochromes P-450, catalases, peroxidases as well as b type cytochromes. protoheme biosynthetic process MetaCyc:PWY-7552 GO:0006785 heme B biosynthesis MetaCyc:HEMESYN2-PWY MetaCyc:HEME-BIOSYNTHESIS-II-1 heme B formation heme B anabolism