FN1 and stroke disorder: Interestingly, in contrast to previously described type A pericytes [23], GFP+ pericyte-derived cells were negative for the fibroblast markers fibronectin, collagen-IV and the fibroblast surface protein (Fig. 8f–h), suggesting that GFP+ pericytes are a subpopulation of pericytes that do not give rise to scar tissue in the brain following stroke.