40S ribosomal protein S21 (RPS21B). Identical to 40S ribosomal protein S21-1 (RPS21B) [Arabidopsis Thaliana] (GB:Q9M337); similar to 40S ribosomal protein S21 (RPS21C) [Arabidopsis thaliana] (TAIR:AT5G27700.1); similar to Ribosomal protein S21e [Medicago truncatula] (GB:ABD28456.2); similar to unknown [Populus trichocarpa] (GB:ABK93958.1); contains InterPro domain Ribosomal protein S21e; (InterPro:IPR001931)