passages.id: split_4_test_3417_passage
passages.type: progene_text
passages.text: Expression of the posterior hox genes hoxb7a , hoxa9a or hoxb9a , which function downstream of Cdx1a / 4 , or activator fusion genes of hoxa9a or hoxb9a ( VP16 - hoxa9a , VP16 - hoxb9a ) suppressed this loss - of - function phenotype .