passages.id: split_8_test_1127_passage
passages.type: progene_text
passages.text: Only two exceptions had been reported - the Enterobacteriaceae and Myxococcus xanthus ( members of the gamma and delta groups of the class Proteobacteria , respectively ) - in which ornithine is produced from N-alpha-acetylornithine by a deacylase , acetylornithinase ( AOase ) ( argE encoded ) .