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(A) Schematic depiction of neofolliculogenesis in embryonic development. (B) Mature hair growth cycle with three distinct phases: anagen (growth phase), catagen (regression phase), and telogen (resting phase). APM, arrector pili muscle (red); DC, dermal condensate (blue); DP, dermal papilla (blue); HS, hair shaft (black); MC, melanocytes; ORS, outer root sheath; SC, sebocytes (yellow); SG, sebaceous gland. Color images available online at www.liebertonline.com/teb
