Figure 3.—

Northern blots of poly(A)⁺ RNA from males and females of S. coprophila probed with the cDNA fragment encompassing the two RBDs of S. ocellaris Sxl cDNA, and Northern blots of total RNA from males and females of R. americana and T. pubescens probed with the cDNA fragment encompassing the two RBD domains of R. americna Sxl cDNA. Hybridization with the actin RNA probe (Fyrberg et al. 1981) for S. coprophila, or the D. melanogaster rDNA probe (pDm238; Roiha et al. 1981) for R. americana and T. pubescens, was used as a loading control for poly(A)⁺ or total RNA, respectively.