>tr|A0A068YWM0|A0A068YWM0_9BURK Small ribosomal subunit protein bS21 OS=Polaromonas sp. CG9_12 GN=rpsU MTTIRVKDNEPFDVALRRFKRTIEKLGLLTDLRAREFYEKPTAERKRKKAAAVKRNYKRI RAMQLPKKLY