passages.id: 1.0alpha7.train.528.sent
passages.type: sentence
passages.text:  Although  Arg binding to  F-actin saturates at a ratio of one  Arg/two  actin molecules, Arg688-1182 seems to bind to  F-actin at a much lower density of approximately one Arg688-1182/five  actin molecules.  
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coreferences.id: 1.0alpha7.train.528.coref1
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