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Mean stimulation index (SI) for expression of IL-5 in lymphocytes from adult horses (n = 5 per group) receiving supplementary inorganic Se (0.3 ppm DM, as sodium selenite), organic Se (0.3 ppm DM, as Se yeast), or receiving no supplementary Se (< 0.05 ppm DM); a,b means with different superscripts are significantly different (P < 0.05); data were log10-transformed before statistical analysis to normalize their distribution.
