FKBP5 and cerebrotendinous xanthomatosis: We injected adenovirus carrying FKBP5 (Ad-FKBP5) or control adenovirus (Ad-Ctrl) into the TA muscles of WT and Klf15KO mice on day 1 after CTX injection and harvested TA muscles to examine regeneration on days 7 and 14 after CTX injury.