ribosomal protein L18 family protein. Identical to 50S ribosomal protein L18, chloroplast precursor (RPL18) [Arabidopsis Thaliana] (GB:Q9SX68); similar to structural constituent of ribosome [Arabidopsis thaliana] (TAIR:AT3G17626.1); similar to unknown [Populus trichocarpa] (GB:ABK95541.1); contains InterPro domain Ribosomal protein L18, bacterial; (InterPro:IPR004389); contains InterPro domain Ribosomal protein L18/L5; (InterPro:IPR005484)