passages.id: split_1_test_1089_passage
passages.type: progene_text
passages.text: Adjacent sections through the vomeronasal organ ( VNO ) and accessory olfactory bulb ( AOB ) were alternately immunostained with antibodies against PDE4A or the G - protein alpha subunit G ( o ) alpha , which labels basal VNO neurons , in order to determine whether PDE4A occurs preferentially in one of two segregated VNO pathways .