Figure 7: Evolutionary scenarios for the emergence of the L12 copy number.
From: Evolution of the protein stoichiometry in the L12 stalk of bacterial and organellar ribosomes
(a) Loss of an L12-binding segments in helix α8 of L10. (b) Acquisition of an additional potential L12-binding segment. The phylogenetic trees are based on 16S rRNA sequences. The predicted L12:L10 stoichiometry is indicated by orange (6:1) or green (4:1) colour. (c) A schematic of a proposed evolutionary path. Dashed lines indicate those changes in the L12:L10 copy number for which only limited experimental evidence exists.
