title: Letter: Ammonia and L-dopa: Parkinson's disease and hepatic encephalopathy.
mesh_terms: D000641:Ammonia / Q000097:blood*; D000818:Animals; D004044:Dietary Proteins; D006501:Hepatic Encephalopathy / Q000188:drug therapy*; D006801:Humans; D007980:Levodopa / Q000627:therapeutic use*; D010300:Parkinson Disease / Q000178:diet therapy / Q000188:drug therapy*
chemical_list: D004044:Dietary Proteins; D007980:Levodopa; D000641:Ammonia