S100B and amyloidosis: S100B surrounding amyloid plaques is mostly produced by astrocytes (Van Eldik and Griffin, 1994; Mrak et al., 1996; Shepherd et al., 2006; Roltsch et al., 2010), but can also originate from oligodendrocytes (Simpson et al., 2010) and microglia (Roltsch et al., 2010).