Different growth rates of pigmented and white hair in the beard: differentiation vs. proliferation?
1995
Summary
A considerable difference in growth rates of pigmented and white anagen beard hair (0-47 mm/day vs. 1.12 mm/day, on average) was measured in three individuals over a 3-ycar period. Nuclear differentiation in the suprabulbar region of hair shafts revealed an earlier, and more intensive, condensation of chromatin in pigmenled hair than in white hair. As other differences (diameter, presence or absence of medulla) between the two hair types could be excluded, the results suggest earlier terminal differentiation of pigmented hair compared with white hair.
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