Backbone Brackets and Arginine Tweezers delineate Class I and Class II aminoacyl tRNA synthetases. - Florian Kaiser; Sebastian Bittrich; Sebastian Salentin; Christoph Leberecht; V. Joachim Haupt; Sarah Krautwurst; Michael Schroeder 001; Dirk Labudde (PLoS Comput. Biol., 2018)