The reaction mixtures following the sulfotransferase assay were analyzed by TLC procedures as described in Materials and Methods. The signals were detected by autoradiography using the Fluoro Image Analyzer (FLA-3000). Compounds analyzed were: lane 1, DMSO (as a control); lane 2, sulfated 4-androstene-3,17-dione; lane 3, sulfated 1,4-androstadiene-3,17-dione; lane 4, sulfated DHEA.