Figure 2.—

The molecular organization of the S. coprophila, R. americana, and T. pubescens Sxl genes and comparison with Sxl of D. melanogaster and S. ocellaris. L and E stand for D. melanogaster and the sciarid Sxl exons (boxes), respectively, and e1 stands for the first exon found only in the early D. melanogaster Sxl transcripts. The dotted lines represent introns. They are not drawn to scale. The uppercase letters on the top of each gene represent the amino acids corresponding to the exon/intron junctions. The beginning and the end of the ORF are indicated by ATG and TGA respectively. RBD1 and RBD2 symbolize the RNA-binding domains.