1O9K:
reference: Crystal structure of the retinoblastoma tumor suppressor protein bound to E2F and the molecular basis of its regulation., Xiao B, Spencer J, Clements A, Ali-Khan N, Mittnacht S, Broceno C, Burghammer M, Perrakis A, Marmorstein R, Gamblin SJ, Proc Natl Acad Sci U S A 2003 Mar 4;100(5):2363-8. PMID: 12598654

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