- Purification, characterization, and crystallization of the components of the nitrobenzene and 2-nitrotoluene dioxygenase enzyme systems. Parales, R.E., Huang, R., Yu, C.L., Parales, J.V., Lee, F.K., Lessner, D.J., Ivkovic-Jensen, M.M., Liu, W., Friemann, R., Ramaswamy, S., Gibson, D.T. Appl. Environ. Microbiol. (2005)