title: Motor neuron disease: changing population patterns and clues for etiology.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000690:Amyotrophic Lateral Sclerosis / Q000453:epidemiology*; D010244:Bulbar Palsy, Progressive; D004298:Dopamine / Q000378:metabolism; D004777:Environment; D005260:Female; D005796:Genes; D006141:Guam; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009046:Motor Neurons; D009133:Muscular Atrophy; D009468:Neuromuscular Diseases / Q000453:epidemiology* / Q000209:etiology; D010300:Parkinson Disease / Q000209:etiology; D044469:Racial Groups; D012737:Sex Factors; D014481:United States
chemical_list: D004298:Dopamine