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. 2023 Feb 6;153(4):949–957. doi: 10.1016/j.tjnut.2023.02.002

FIGURE 1.

FIGURE 1

Serum vitamin A 13C natural isotopic abundance in humans by study and lactation status from 6 African countries. 13C isotopic abundance is the fraction of 13C out of total carbon (%). Data are mean ± SD. Serum retinol and milk vitamin A 13C isotopic abundance means without a common letter differ, P < 0.05.