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These were indicated by the higher melting temperatures (by 3-6 °C) and the higher expression levels that were typically observed for the MtPylRS and MfPylRS mutants relative to the Mb equivalents. Using histone H3 as an example, we demonstrated that one of the thermophilic synthetase mutants promoted the incorporation of multiple acetyl-lysine residues in mammalian cells. The enzymes developed in this study add to the PylRS toolbox and provide potentially better scaffolds for PylRS engineering and evolution, which will be necessary to m