Page 1. XENOBIOTICA, 1996, VOL. 26, NO. ... The volume and molarity were kept constant in assays containing inhibitor by diluting the microsomes in 75 pI instead of 100 pl5 mM Tris, 1.15 (w/v) KCI to compensate for the 25 pI of DCMB solution added to the incubation. ...