Fig. 1.

An unusual 5S rRNA insertion. A schematic diagram showing (A) a possible secondary structure of the insert as predicted by mfold [50] and RNAstructure [51] and (B) the usual 5S rRNA secondary structure model (available at RNAcentral (https://rnacentral.org/) and the Comparative RNA Web (CRW) Site( http://www.rna.ccbb.utexas.edu)) [52, 53] and modified; the insert is between positions U104 and G105 as per Halococcus morrhuae 5S rRNA numbering. The equivalent positions in Haloarcula marismortui are C108 and G109. What would be the 5′ and 3′ ends of the insert if it were an independent RNA are indicated in (A).