passages.id: split_5_test_78_passage
passages.type: progene_text
passages.text: With 14 kb of 5' flanking sequence , lacZ expression was observed in the cardiac crescent at E7.5 , and in the outflow tract , the interatrial groove , the atrioventricular canal and right and left ventricles , as well as in pharyngeal floor , thyroid primordia , and stomach at E10.5 .