Target small RNAs (sRNAs) of FinO/ProQ domain proteins. Putative ProQ-binding sites in yellow. Regions involved in base-pairing with target mRNAs are circled in red. Guanine-cytosine pairs are depicted by double bars, adenine-uracil pairs are depicted by single bars, and bars with circles represent guanine-uracil pairs. (a) cis-Acting FinP sRNA from Escherichia coli F plasmid, which is bound by FinO. (b) trans-Acting RocR sRNA from Legionella pneumophila, which is bound by RocC. (c) trans-Acting RaiZ sRNA from Salmonella enterica, which is dependent on ProQ.