epidermis
Vitamin C Flips the Skin’s “Youth Genes,” Reversing Age-related Thinning, Study Says
The skin acts as the body’s first line of defense against external threats. However, as we age, the epidermis—the outermost layer of skin—gradually becomes thinner and loses its protective strength. About 90 percent of the cells in this layer are keratinocytes, which originate from deeper layers of the epidermis and migrate upward, ultimately forming the ...
Vitamin A May Play a Central Role in Stem Cell Biology and Wound Repair
Retinoic acid, the active state of vitamin A, appears to regulate how stem cells enter and exit a transient state central to their role in wound repair. When a child falls off her bike and scrapes her knee, skin stem cells rush to the rescue, growing new epidermis to cover the wound. But only some ...
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