PDGFRB and Duchenne muscular dystrophy: Interestingly, PDGFRβ and VCAM1 markers, which are expressed by FAPs in mdx mice, a mouse model of DMD, were also present in a large fraction of these cells, but the proportion of VCAM1+ cells was higher in the FibMCT and FibMOP cells than in the MCT cells (FigureS2a,b).