A compilation of large subunit (23S- and 23S-like) ribosomal RNA structures.

The present edition of large subunit (LSU; 23S and 23S-like) rRNA secondary structures updates and refines the collections of 1988 [1] and 1990 [2]. As in [1] and [2], each LSU rRNA sequence is presented as a secondary structure, a two-dimensional format that represents, in part, the biologically relevant conformation of the rRNA molecule. When LSU rRNA sequences are configured in this manner, valuable phylogenetic information is readily extracted, facilitating the identification of conserved and variable regions. At the same time, the secondary structure serves as an effective template for relating form to function.