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CYP3A4‐mediated vitamin D hydroxylation. Ratio of serum 4ß,25(OH)2D3 and 25(OH)D3 in unrelated participants from the Yukon‐Kuskokwim (YK) Delta (n = 514) by CYP3A4 diplotypes: individuals with no CYP3A4*1G (n = 457) and individuals who at least one copy of CYP3A4*1G (n = 57). A t‐test was used to compare the two groups
