Heme b Back Image heme_b Download Metadata Metal Iron CategoryHeme ProteinsNameHeme bMetal CoordinationOctahedralLigandsHis, HisMetal OxidationFe3+ | Fe2+Spin StatesS=1/2 | S=0Spectroscopic Fingerprint ID_02 Technique EPR | ID_05 Technique RR | ID_03 Technique NMR Example Accession bc1 / bc6f complex globins