AcKRS2 RS/tRNA Pair Development Year 2008 ncAA(s) Incorporated Nε-acetyl-L-lysine N6-Trifluoroacetyl-L-lysine
SepRS2/Sep-tRNA-v2 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)