Aminoacyl-tRNA synthetases are a class of enzymes that charge tRNAs with their cognate amino acids. MARS belongs to the class I family of tRNA synthetases.Aminoacyl-tRNA synthetases are a class of enzymes that charge tRNAs with their cognate amino acids. The protein encoded by this gene belongs to the class I family of tRNA synthetases. Publication Note: This RefSeq record includes a subset of the publications that are available for this gene. Please see the Entrez Gene record to access additional publications.