The Hair Pigmentation Unit And Hair Graying
February 2005
in “
CRC Press eBooks
”
TLDR Hair color is due to active pigment cells in hair during growth.
The document discussed how hair color is determined by the presence or absence of melanins in the hair cortex, which are produced through melanogenesis in melanosomes by melanocytes. Unlike epidermal melanocytes, hair melanocytes remain permanently active during the hair's growing phase (anagen), likely due to a specific but not fully understood regulatory network.
