Schematic drawing of hypothesized trends in hair evolution from a synapsid-scaled integument
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I couldn’t improve upon the existing caption to this intriguing image, which accompanies this intriguing article.
Albardi, L. 2004. Comparative aspects of the inner root sheath in adult and developing hairs of mammals in relation to the evolution of hairs. Journal of Anatomy 205: 3, pp. 179-200.
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