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Deuterium enrichments in alanine in human serum. ◇, Free alanine 2H enrichments in serum; ◆, alanine 2H enrichments in serum proteins. Data points are means ± SE, although the SE values may be smaller than the symbols. A: initial labeling period, days 0–3 after administration of deuterated water (n = 4). B: time course out to 85 days after the initial intake of deuterated water (n = 7).
