title: On the frequency of arginine in proteins and its implications for molecular evolution.
mesh_terms: D001120:Arginine / Q000032:analysis*; D005075:Biological Evolution; D008239:Lysine / Q000032:analysis; D008954:Models, Biological; D014176:Protein Biosynthesis; D011487:Protein Conformation; D011506:Proteins / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism
chemical_list: D011506:Proteins; D012333:RNA, Messenger; D001120:Arginine; D008239:Lysine