Glenn R. Johnson and Jim C. Spain 2003. “Evolution of catabolic pathways for synthetic compounds: bacterial pathways for degradation of 2,4-dinitrotoluene and nitrobenzene.” Applied Microbiology and Biotechnology, 62(2-3), pp. 110-123
Glenn R. Johnson, Rakesh K. Jain, and Jim C. Spain 2003. “Origins of the 2,4-Dinitrotoluene Pathway.” Journal of Bacteriology, 184(15), pp. 4219-4232
I might wonder whether anyone has ever claimed that these are cases of irreducibly complex systems?
But this does suggest what the evolutionary community has done to "refute" Behe: first claim that some system is "irreducibly complex", and then show that it isn't.
That tactic reminds me of the logical technique the Greeks used when they assumed that God exists, defined what his attributes must be, and then proceeded to prove from these starting assumptions that God doesn't exist (this seems to prove only that they screwed up somewhere along the line).
What the critics haven't done is to take a system which Behe claims is irreducibly complex (the bacterial flagellum) and refute that one.