1LWX:
reference: X-ray analysis of azido-thymidine diphosphate binding to nucleoside diphosphate kinase., Xu Y, Sellam O, Morera S, Sarfati S, Biondi R, Veron M, Janin J, Proc Natl Acad Sci U S A 1997 Jul 8;94(14):7162-5. PMID: 9207061

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