1AP7:
reference: Structure of the cyclin-dependent kinase inhibitor p19Ink4d., Luh FY, Archer SJ, Domaille PJ, Smith BO, Owen D, Brotherton DH, Raine AR, Xu X, Brizuela L, Brenner SL, Laue ED, Nature 1997 Oct 30;389(6654):999-1003. PMID: 9353127

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