Then we sorted out muscle resident CD45− cells (which include CD31+ endothelia cells, CD31−Sca-1+ fibro/adipogenic progenitors, CD31−α7-integrin+ myoblast), CD45+CD11b+ monocytes, and CD45+CD3+ T cells from CTX-injured WT muscles at day 1 and day 3 after CTX injury and examined the mRNA levels of C3aR by real-time PCR. This evidence concerns the gene C3AR1 and cerebrotendinous xanthomatosis.