>tr|A0A2K9PDV0|A0A2K9PDV0_9ENTR Small ribosomal subunit protein bS21 OS=Citrobacter freundii complex sp. CFNIH2 GN=rpsU MPVIKVRENEPFDVALRRFKRSCEKAGVLAEVRRREFYEKPTTERKRAKASAVKRHAKKL ARENARRTRLY