Sex- and tissue-specific expression of alternative transcripts from six D. melanogaster mRNA splicing regulator genes (solid bars, males; open bars, females). The RT–PCR results are analyzed as the average ratio of CT values for the two exon junctions amplified for each gene (y-axis), and error bars show the standard deviation. (A) Ratio of transcripts mub-RA,-RB,-RC and mub-RD. (B) Ratio of transcripts Rm62-RA,-RD and Rm62E-RB. (C) Ratio of transcripts B52-RA,-RC,-RE,-RG,-RH and B52-RF,RH. (D) Ratio of transcripts Psi-RA/Psi-RB,-RC. (E) Ratio of transcripts sqd-RD and sqd-RA. (F) Ratio of transcripts ps-RB,-RJ and ps-RC.