passages.id: 1.0alpha7.train.862.sent
passages.type: sentence
passages.text: Fractionation of splicing extracts showed that two fractions associated with  U2 snRNP,  SF3a and  SF3b, are required for the binding of  U2 snRNP to  pre-mRNAs ( 10,  31).
coreferences.id: 1.0alpha7.train.862.coref0
coreferences.entity_ids: 1.0alpha7.train.862.ent0_0
coreferences.id: 1.0alpha7.train.862.coref1
coreferences.entity_ids: 1.0alpha7.train.862.ent1_0
coreferences.id: 1.0alpha7.train.862.coref2
coreferences.entity_ids: 1.0alpha7.train.862.ent2_0 1.0alpha7.train.862.ent3_1
coreferences.id: 1.0alpha7.train.862.coref3
coreferences.entity_ids: 1.0alpha7.train.862.ent4_0