Bob Walsh (walshb at beep.roadrunner.com) wrote:
: ... do the follicle cells for a grey hair have the
: same DNA as the follicle cells for a normally pigmented hair taken
: from the same individual on the same day?
Following up on my own question:
"Hair pigment is made by melanocytes at the base of the hair follicle
.... Gray or white hair results from a decrease in melanin production
(mediated by delayed-action genes) and the replacement of melanin by
air bubbles in the hair shaft." Elaine N. Marieb, Human Anatomy and
Physiology, 1992. No futher discussion or references given there
on "delayed-action genes."
Bob Walsh (walshb at alumni.caltech.edu)
Santa Fe, NM, USA (505) 263-1875
FAX: (505) 983-5868