Neonatal thimerosal-induced changes of pituitary hormone levels in mouse brains. Radioimmunoassay was carried out to detect the serum hormone levels of PRL, ACTH, LH, FSH, CGB, TSH, GH, and testosterone. The t-test was used to analyze the difference of each hormone level between the thimerosal-treated samples and the placebo-treated samples. p-values (t-test) < 0.05 are considered significant difference. The fold change (Bultynck et al., 2004) for each hormone: FC = thimerosal mean/placebo mean. In order to be more intuitive, we plotted the hormone level changes as the logarithm of FC. (a) log₂ (Bultynck et al., 2004) for each hormone in 3 weeks old male mice (n = 3). (b) log₂ (Bultynck et al., 2004) for each hormone in 3 weeks old female mice (n = 3). *p < 0.05; **p < 0.01.