>tr|A0A4U6JGM5|A0A4U6JGM5_9ENTR Small ribosomal subunit protein bS21 OS=Citrobacter sp. TBCS-14 GN=rpsU MPVIKVRENEPFDVALRRFKRSCEKAGVLAEVRRREFYEKPTTERKRAKASAVKRHAKKL ARENARRTRLY