title: Classes of aminoacyl-tRNA synthetases and the establishment of the genetic code.
authors.affiliation: Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.
authors.forename: P
authors.initials: P
authors.lastname: Schimmel
mesh_terms: D000604:Amino Acyl-tRNA Synthetases / Q000145:classification* / Q000502:physiology; D005075:Biological Evolution; D005815:Genetic Code / Q000502:physiology; D008968:Molecular Conformation
chemical_list: D000604:Amino Acyl-tRNA Synthetases