1.9.6.1 - 395176, 684990, 695337, 697696, 698544 1.9.6.1 copurification of recombinant NapA complexed with N-terminally His-tagged NapD activator by nickel afinity chromatography from Escherichia coli strains MC4100 and BL21(DE3) 742486 1.9.6.1 of NapA and NapB 674891