pspPhe-RS (pCNF-RS ; pAzF-RS) RS/tRNA Pair Development Year 2009 ncAA(s) Incorporated p-cyano-L-phenylalanine p-ethynyl-L-phenylalanine p-azido-L-phenylalanine (pAzF)
SepRS9/tRNA-SepA37 + EF-Sep21 (SepOTSλ) RS/tRNA Pair Development Year 2015 ncAA(s) Incorporated phosphoserine
SepRS2/Sep-tRNA-v2 (Permaphos system) RS/tRNA Pair Development Year 2023 ncAA(s) Incorporated 2-amino-4-phosphonobutanoic acid (nhpSer)
SepRS2/Sep-tRNA(B4) RS/tRNA Pair Development Year 2015 ncAA(s) Incorporated phosphoserine 2-amino-4-phosphonobutanoic acid (nhpSer)