passages.id: 1.0alpha7.train.1186.sent
passages.type: sentence
passages.text: Hence, mutants of  cyclin E that cannot bind to  CDK2 are biologically inert (Kelly et al. 1998  ), and  ectopic overexpression of a catalytically inactive mutant of  CDK2 prevents a cell from entering  S phase (Heuvel and Harlow 1993  ).
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coreferences.id: 1.0alpha7.train.1186.coref2
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