User:GregorG77

= Yfr2 = The Yfr2 (c y anobacterial  f unctional  R NA) family of non-coding RNAs was initially detected by a comparative genomics based screen for non-coding RNAs in marine cyanobacteria. The four copies, Yfr2, Yfr3, Yfr4 and Yfr5 were found to be highly expressed in Prochlorococcus MED4. In other, closely related strains of Prochlorococcus and Synechococcus different copy numbers of non-coding RNAs belonging to this family were found, exhibiting a high similarity of predicted secondary structures and sequence conservation. Members of the Yfr2 family were also verified in Synechocystis sp. PCC6803 and predicted in some more cyanobacteria. They all share a conserved single-stranded sequence motif present in the terminal loop of a stem loop. Sizes of non-coding RNAs belonging to this family vary between 63 and 100 nucleotides.The representatives from marine cyanobacteria are on average 22 nt longer than those from freshwater cyanobacteria and carry an additional stem loop, located 3´ to the first one. Nearly all cyanobacterial genomes sequenced to date encode up to nine copies of Yfr2, that can be predicted based on the conservation of secondary structure. The function of this family of non-coding RNAs is still unclear.