Immunofluorescence images illustrating how palbociclib blocks the paclitaxel-induced accumulation of cleaved caspase 3+ (G) cells in the K15+ bulge and proximal bulb ORS (pbORS) compartments. CTS - connective tissue sheath; HS - hair shaft; pbORS - proximal bulb outer root sheath; wo - washout. 20 µm scale. 