passages.id: 1.0alpha7.train.421.sent
passages.type: sentence
passages.text:  Lanes 16 and 17 are a longer autoradiographic  exposure of lanes 14 and 15, to more clearly demonstrate the previously reported observation that  MEIS1 binds to  HOXA9 in the absence of  PBX proteins ( 41).  
coreferences.id: 1.0alpha7.train.421.coref0
coreferences.entity_ids: 1.0alpha7.train.421.ent0_0
coreferences.id: 1.0alpha7.train.421.coref1
coreferences.entity_ids: 1.0alpha7.train.421.ent1_0
coreferences.id: 1.0alpha7.train.421.coref2
coreferences.entity_ids: 1.0alpha7.train.421.ent2_0