DA, dopamine; LB, Lewy body; ND, not determined; PrP, prion; PDGFβ platelet-derived growth factor β. 1LB-like inclusions by definition contain filamentous α-synuclein. 2ND could include some degree of behavioral impairment in spontaneous and locomotor activity and in response to sensory stimulation. §Controversial. The opposite result has also been shown.