ERβ mRNA expression in rat and mouse cerebellar granule cells treated with 17β-estradiol (E2), triiodo-thyronine (T3), bisphenol A (BPA), zearalenone (ZEN), arsenic (As), alone or in combination with the hormones. (a) Relative expression level of the Erβ gene was analyzed by qRT-PCR and normalized to the average of the control gene β-actin or Gapdh. Shown p-values were calculated compared to ntC. (b) Relative expression of Erβ mRNA in rat versus mouse non-treated controls, normalized to β-actin or Gapdh (p-value not shown). The data shown here are the mean ± standard deviation (SD) of at least three independent experiments (n = 5 per treatment).