>tr|A0A2S6Z1Y4|A0A2S6Z1Y4_9XANT Small ribosomal subunit protein bS21 OS=Xanthomonas arboricola pv. populi GN=rpsU MPSVKVRENEPFEFALRRFKRTCEKAGVLAETRKREFYEKPTQERKRKAAAAVKRQLRRS SRDVTKRQRLY