The procedure was conducted as previously described38 (link)–40 (link). Briefly, age-, sex- and weight-matched animals were used and housed together for at least 14 days prior to surgery. Each mouse’s corresponding lateral aspects were shaved, incisions were made from the fore-limb joint to the hind-limb joint and the subcutaneous fascia was bluntly dissected to create 0.5 cm of free skin. Fore- and hind-limb joints were joined and the dorsal and ventral skins were approximated by continuous suture using mononylon 5.0 (Ethicon).