passages.id: split_5_test_2668_passage
passages.type: progene_text
passages.text: Purified recombinant NMNAT-2 is endowed with NMN and nicotinic acid mononucleotide adenylyltransferase activities , but differs from NMNAT-1 with regard to chromosomal and cellular localization , tissue - specificity of expression , and molecular properties , supporting the idea that the two enzymes might play distinct physiological roles in NAD homeostasis .