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Paired adrenal gland:body weight ratios (mean ± SE) for male Sprague–Dawley rats after 4 wk of oral gavage, where 1 = control group, 2 = restraint alone group, 3 = dry gavage, 4 = gavage-singly housed, and 5 = gavage-pair housed. *, Value significantly (P < 0.02) decreased compared with other paired adrenal gland:body weight group values.
