2WK6:
reference: Structures of native human thymidine phosphorylase and in complex with 5-iodouracil., Mitsiki E, Papageorgiou AC, Iyer S, Thiyagarajan N, Prior SH, Sleep D, Finnis C, Acharya KR, Biochem Biophys Res Commun. 2009 Jun 23. PMID: 19555658

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