C Itgα6 and aCas3 Immunofluorescence staining of catagen tailskin HF of control (Ctr) and Bcl-2EOE mice (n=4 biological replicates). Dashed lines: retracting strands. Scale bar, 100 µm. D Quantification of aCas3+ cells in the RS of P19 Ctr and Bcl-2EOE mice (n=4 biological replicates; mean ± standard deviation (SD); **** p<0.0001, two-tailed unpaired Student's t-test). HF: hair follicle. 