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Arsenic exposure alters metabolic circadian rhythm. A: mean food consumption was calculated for 2–3 alternating 12-h light-dark cycles. B: mean ratio of dark cycle-to-light cycle food consumption. C: mean respiratory exchange ratio (RER) measured within 12-h light-dark cycles. D: mean change in 12-h RER between successive light and dark cycles; n = 6 mice per group (cohort 4). Data are means ± SE; *P < 0.05, **P < 0.01.
