5HKP:
reference: Crystal structure of a tankyrase 1-telomere repeat factor 1 complex., Li B, Qiao R, Wang Z, Zhou W, Li X, Xu W, Rao Z, Acta Crystallogr F Struct Biol Commun. 2016 Apr;72(Pt 4):320-7. doi:, 10.1107/S2053230X16004131. Epub 2016 Mar 24. PMID: 27050267

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