However, the number of IL-10+ MCs was significantly decreased in lesional and non-lesional AA skin compared to healthy controls (Figure 5A–D), and the few IL-10+ MCs which remained visible in AA patients were localized only rarely in the perifollicular mesenchyme (i.e CTS or PFD) (Figure 5B). The gene discussed is IL10; the disease is polyostotic fibrous dysplasia.