| http://www.w3.org/ns/prov#value | - Thus, says Sun, the relative changes in the two types of cells can serve as an index for scoring natural or intrinsic skin aging.Intrinsic - extrinsicThis is different from extrinsic aging, which is caused primarily by sun exposure.There are a lot of extrinsic factors that can accelerate the aging process, such as smoking, ultraviolet light, and stress, says Sun.The researchers found that the
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