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Fig. S1. K14 and K5 expression in the outer layer of different HF types. In toto views of mouse back
skin characterised by keratin immunostaining. (A-C9) K14 expression in zigzag (A,A9), awl3 (B,B9) and
guard hairs (C,C9). (A,B,C) Bright-field view of each HF type. (A9,B9,C9) Bright-field view of each HF
type and maximal projections of the K14 staining (yellow). (D) K5 expression (green) in HF sections from a
mT/mG mouse with labelled membranes (red). All back skin HF types present a proximal limit of K14- and
K5-expressing cells above the bulb (white arrows). Scale bars: 50 mm.