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The mammalian hair follicle (HF) is a complex structure composed of several distinct cell layers. The HF is an ectodermal appendage that resides in the skin, and unlike other tissues and organs, it possesses the remarkable ability to self-renew and undergoes a hair cycle that persists in adult life. Stem cells in the bulge region of the HF, as well as dermal papilla cells, play key roles in the regulation of successive hair cycles. Recent advances in molecular genetics have enabled the identification of many genes and pathways that are involved in HF morphogenesis and cycling. Furthermore, mutations in some of these genes are associated with hereditary hair diseases in humans. Identification of causative genes for hair diseases has provided a better understanding of the crucial roles of these genes in HF morphogenesis, development, and hair growth in humans.
Department of Dermatology, Columbia University, New York, NY 10032, USA.
This article was published in the following journal.
Name: Annual review of genomics and human genetics
Hair cortisol concentration (HCC) has been suggested as a promising marker for chronic stress. However, studies investigating the influence of hair dyeing and hair washing frequency on HCC have shown ...
Cartilage-hair hypoplasia (CHH) is an autosomal recessive chondrodysplasia caused by RMRP (RNA component of mitochondrial RNA processing endoribonuclease) gene mutations. Manifestations include short ...
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Hair samples from subjects on antiretroviral therapy, both HIV- and HIV+ patients with HIV RNA 6 months will be analyzed to investigate the influence of race, hair color and hair treatment...
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Alopecia areata is a medical condition, in which the hair falls out in patches. The hair can fall out on the scalp or elsewhere on the face and body. Alopecia areata is an autoimmune skin...
Hair grooming and cleansing aids or other products meant for topical application to hair, usually human. They include sprays, bleaches, conditioners, rinses, shampoos, nutrient lotions, etc.
Auditory sensory cells of organ of Corti, usually placed in one row medially to the core of spongy bone (the modiolus). Inner hair cells are in fewer numbers than the OUTER AUDITORY HAIR CELLS, and their stereocilia are approximately twice as thick as those of the outer hair cells.
Sensory cells in the organ of Corti, characterized by their apical stereocilia (hair-like projections). The inner and outer hair cells, as defined by their proximity to the core of spongy bone (the modiolus), change morphologically along the cochlea. Towards the cochlear apex, the length of hair cell bodies and their apical stereocilia increase, allowing differential responses to various frequencies of sound.
Chemicals that are used to oxidize pigments in HAIR.
A tube-like invagination of the EPIDERMIS from which the hair shaft develops and into which SEBACEOUS GLANDS open. The hair follicle is lined by a cellular inner and outer root sheath of epidermal origin and is invested with a fibrous sheath derived from the dermis. (Stedman, 26th ed) Follicles of very long hairs extend into the subcutaneous layer of tissue under the SKIN.
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