Our analysis demonstrated that PDGF-D increased the coverage of CD31+ microvessels by PDGFRβ+ pericytes (P = 0.0568) (Fig. 4a, b), and reduced the ratio of pericytes that are not attached to endothelial cells (Fig. 4c) at the lesion site, 1 week after stroke. The gene discussed is PECAM1; the disease is stroke disorder.