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Correlation between serum and fecal corticoid values in captive Spermophilus beldingi, (a) measured with corticosterone antibody (n =48 samples from 16 animals; y =0.3458x + 7.2055) and (b) measured with cortisol antibody (n =24 samples from 11 animals; y =2.0055x + 92.088).
