the eukaryotic small ribosomal subunit proteins are also present in archaea (no ribosomal protein is exclusively found in archaea), confirming that they are more closely related to eukaryotes than to bacteria.

Among the large ribosomal subunit (RPLs), 18 proteins are universal, i.e. found in both bacteria, eukaryotes, and archaea. 14 proteins are only found in bacteria, while 27 proteins are only found in archaea and eukaryotes. Again, archaea have no proteins unique to them.

Essentiality

Despite their high conservation

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