HS-68-positive inclusions in multiple system atrophy (MSA) and Parkinson’s disease (PD). a Structure of the luminescent conjugated oligothiophene HS-68. b MSA and PD brain sections from cases 8 (cerebellum) and 15 (substantia nigra), respectively, stained with HS-68 and labelled using the pS129 α-syn antibody. HS-68 stained glial cytoplasmic inclusions in MSA (arrowheads), as well as Lewy bodies and Lewy neurites in PD (arrowheads). Red/orange structures represent autofluorescent lipofuscin. Scale bars, 20 μm.