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Distal side of the heme pocket in the homology molecular models of the new C. virescens (A) and D. caldariorum (B) UPOs, with indication of the differing homologous residues (red) that were mutated for Table 3, compared with the same region in the crystal structures of the A. aegerita (C) and M. rotula (D) UPOs (PDB entries 2YP1 and 5FUJ, respectively).
