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Abstract
The most important feature of hair growth is the cyclic activity of hair follicles
in which an active phase, anagen, is succeeded by a resting phase, telogen, during
which the fully formed hair remains anchored in the follicle. Between anagen and telogen
there is a short transitional phase called catagen. In 1924, Trotter1 recognized that such a cycle existed in man. Two years later, Dry2 described the cycle in detail for the mouse and first used the terminology, which
currently is universally accepted. A detailed account of the hair cycle in the human
scalp, however, awaited the work of Kligman in 1959.3 Today, his pictures still provide classic illustrations of the sequence of events.
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© 1988 Published by Elsevier Inc.
