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Schematic unrooted phylogenetic tree according to archaea model showing stoichiometry of ribosomal stalk complexes determined by MS. A (L12)6:L10 stoichiometry of the stalk complexes is indicated in red, (L12)4:L10 and (P1/P2)4:P0 stoichiometries are indicated in blue, and species in which both are found are shown with both blue and red.
