PPARG and cerebrotendinous xanthomatosis: For this, we purified PDGFRα+ FAPs using Magnetic activated cell sorting (MACS) 3 days after a CTX injury and evaluated the expression of the key early adipogenic genes Cebpα (CCAAT enhancer binding protein alpha) and Pparγ (Peroxisome proliferator activated receptor gamma) (Fig. 1f).