Amino Acid One-Letter Abbreviations General R Group AlanineA ArginineR AsparagineN Aspartic AcidD CysteineC Glutamic AcidE GlutamineQ GlycineG HistidineH IsoleucineI LeucineL LysineK MethionineM PhenylalanineF ProlineP SerineS ThreonineT TryptophanW TyrosineY ValineV ValineNonpolar TyrosinePolar TryptophanNonpolar ThreoninePolar SerinePolar ProlineNonpolar PhenylalanineNonpolar MethionineNonpolar LysineBasic LeucineNonpolar IsoleucineNonpolar HistidineBasic GlycineNonpolar GlutaminePolar Glutamic AcidAcidic CysteinePolar Aspartic AcidAcidic AsparaginePolar ArginineBasic AlanineNonpolar