An accident or major trauma, surgery requiring anaesthetic, or a very high fever (over 101(r)F), for example, will impact the hair cycle
In addition to the keratin genes and keratin-associated protein genes, researchers also found several enzymes of amino acid biosynthesis, with implications in regulating primary hair growth and hair cycle
In the mouse, IGFBP-3 protein has been localized to the zone of follicular apoptosis at the onset of the regression phase of the hair cycle
(Botchkarev et al.
Dermal papilla cells (DPCs), a group of specialized fibroblasts within the hair follicle bulb, have an essential function in the control of hair growth not only in the normal hair cycle
but also in the pathogenesis of certain conditions, for example in androgenetic alopecia (Inui et al.
Proanthocyanidins from grape seeds promote proliferation of mouse hair follicle cells in vitro and convert hair cycle
This is the hair cycle
and it has 3 stages: Anagen, is the active growth period and its length varies from one person to another, lasting about 1,000 days or more; Catagen is the resting or intermediate period, lasting about 10 days; Telogen is the shedding period, lasting about 100 days.