TGFB1 and myeloid sarcoma: We treated microglia with TGFβ since (a) it is known to alter ECM production in other cell types (Ignotz & Massagué, 1986; Laping et al., 2002), (b) microglia express high levels of TGFβ receptors (Lavin et al., 2014), and (c) it is present in MS lesions (De Groot, Montagne, Barten, Sminia, & Van Der Valk, 1999).