1E2I:
reference: Nucleoside binding site of herpes simplex type 1 thymidine kinase analyzed by X-ray crystallography., Vogt J, Perozzo R, Pautsch A, Prota A, Schelling P, Pilger B, Folkers G, Scapozza L, Schulz GE, Proteins 2000 Dec 1;41(4):545-53. PMID: 11056041

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