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Deuterium enrichments in alanine in human myofibrillar and skin collagen proteins. Values are alanine 2H enrichments for individual subjects in myofibrillar proteins (▲, ■, ◆, ●, and gray diamonds; n = 4 on day 42 and n = 5 on days 80, 85, and 90) and in skin collagen protein (○; n = 2). By day 80, alanine 2H enrichment was not detectable in skin collagen, and no collagen points are shown.
