GCA_000012465.1 PMN2A_R0018 definition tRNA-Val GCA_000012465.1 PMN2A_1208 definition divalent cation transporter GCA_000012465.1 PMN2A_1281 definition valyl-tRNA synthetase GCA_000012465.1 PMN2A_1281 gene_symbol valS GCA_000012465.1 PMN2A_R0027 definition tRNA-Val