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Crystal structure of the FMO protein from Cba. tepidum (PDB code 3ENI, visualized in PyMOL), highlighting the cysteine residues of interest and their proximity to BChl a 2 and 3 in a single protein monomer. BChl a phytyl tails are omitted for clarity. Black dotted lines are labeled with interatomic distances of interest. Brown dotted lines represent protein-to-pigment coordination bonds.
