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LSU rRNA secondary structures. (A) E. coli, (B) S. cerevisiae, and (C) H. sapiens. The color indicates the proximity in three dimensions to the site of peptidyl transfer. Blue is close to the site of peptidyl transfer and red is remote. In the secondary structures, the sites of expansion from E. coli to S. cerevisiae and from S. cerevisiae to H. sapiens are marked by arrows. Nucleotides that were not experimentally resolved in three dimensions are gray on the secondary structures.
