passages.id: split_8_test_1476_passage
passages.type: progene_text
passages.text: The cytochrome P-450 , subfamily I , polypeptide 1 ( CYP1A1 ) , somatostatin receptor 1 ( SSTR1 ) and transcription termination factor 1 ( TTF1 ) genes , predicted to reside on SSC7q based on chromosome painting studies , were selected for genetic mapping in the pig .