The radioactivity assay, adrenochrome, and fluorogenic assays were performed as described previously,[9 (link),13 (link),25 (link)] using tritium labeled cis-stilbene oxide, epibromohydrin (Sigma), and CMNGC (3) as substrates, respectively. For assays with CMNGC, measurements were taken using a fluorescent plate reader with λex = 330 nm and λem = 465 nm.