High Quality Content by WIKIPEDIA articles! Bacterial small RNAs (sRNA) are small (50-250 nucleotide) non-coding RNA molecules produced by bacteria, they are highly structured and contain several stem-loops. Numerous sRNAs have been identified using both computational analysis and laboratory-based techniques such as microarrays and Northern blotting in a number of bacterial species including Escherichia coli, the nitrogen-fixing alpha-proteobacterium Sinorhizobium meliloti, marine cyanobacteria, Francisella tularensis (the causative agent of tularaemia) and the plant pathogen Xanthomonas oryzae pathovar oryzae.