Page 1. XENOBIOTICA, 1994, YOL. 24, NO. 1, 1-16 ... lli(~rosoiiicrl iticrrhotiotrs Incubations were conducted in 13 x 100 nim culture tubes ivith 'Teflon-lined screu caps and typically contained 4.0 mg niicrosomal protein and 34pmol suhstrate (added neat) in :I volume of 2.0 ml. ...