passages.id: 1.0alpha7.train.819.sent
passages.type: sentence
passages.text: The fact that  CKI binding of  dPER and  mPER1 has been preserved while the location and sequence of the binding site may have been shuffled suggests there is strong selective pressure to maintain the interaction of the two proteins.
coreferences.id: 1.0alpha7.train.819.coref0
coreferences.entity_ids: 1.0alpha7.train.819.ent0_0
coreferences.id: 1.0alpha7.train.819.coref1
coreferences.entity_ids: 1.0alpha7.train.819.ent1_0
coreferences.id: 1.0alpha7.train.819.coref2
coreferences.entity_ids: 1.0alpha7.train.819.ent2_0