1S6V:
reference: Crystal structure and characterization of a cytochrome c peroxidase-cytochrome c site-specific cross-link., Guo M, Bhaskar B, Li H, Barrows TP, Poulos TL, Proc Natl Acad Sci U S A 2004 Apr 20;101(16):5940-5. Epub 2004 Apr 7. PMID: 15071191

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