4LPI:
reference: How a novel tyrosine-heme cross-link fine-tunes the structure and functions of heme proteins: a direct comparitive study of L29H/F43Y myoglobin., Yan DJ, Yuan H, Li W, Xiang Y, He B, Nie CM, Wen GB, Lin YW, Tan X, Dalton Trans. 2015 Oct 27;44(43):18815-22. doi: 10.1039/c5dt03040d. PMID: 26458300

This OCA Structure page
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