Southern blot of DNA from rainbow trout hybridized with a 180-bp fragment of the rainbow trout hFMO cDNA. Total DNA from a single fish was isolated, and 5 μg was digested with the different restriction enzymes EcoRV, PstI, BamHI, EcoRI, and HindIII and double digestions HindII/PstI and BamHI/PstI; lanes 1 through 7, respectively. A 0.8% agarose gel was run and DNA blotted to a nylon membrane. Hybridization was carried out under high stringency conditions. Arrowheads indicate the predicted fragments generated from digestion of hFMO.