Fig. 1

Mouse hair follicle density decreases as mice age. A Schematic showing hair follicle-innervating LTMR neuron subtypes projecting to the skin, where their axons branch and selectively innervate specific hair follicle types. B-G Sagittal sections of mouse back skin stained with DAPI to highlight hair follicle structures. Section height increases, then decreases as mice age and progress through the hair follicle life cycle. Scale bar – 50 μm. H Hair follicle density remains stable for the first week of postnatal life, then decreases as mice grow. N = 6(P1), 3(P3), 6(P6), 10(P14), 3(P21), 5(P60)