Structure and expression analyses of species-specific intergenic sRNAs. Expression profiles, northern analyses and structural predictions for: (A) S. avermitilis sRNAs sar2765 (left) and sar3980 (right); (B) S. coelicolor sRNAs scr3716 (left) and scr3931 (right); (C) S. venezuelae sRNA svr5535. For each expression profile, relative sequence reads for genes encoded on the positive strand (top) are shown in red (long transcript library) and orange (sRNA-enriched library), while negative strand profiles are shown in blue (long transcript library). As expression levels for different genes varied greatly, the y-axes of each panel were scaled independently. Northern blots, shown below each coverage graph, revealed sRNA expression throughout development (time of RNA harvest is shown in hours). 5S rRNA was probed as a control for RNA quantity and integrity.