Elevation of blood Pb levels in adult guinea pigs subjected to Pb exposure for 2, 4 and 6 months. Each bar represents the mean ± SEM. ***: p<0.01 among different Pb exposure time groups, F = 103.352, one-way ANOVA. *: p<0.05 between Pb exposure group vs same age-matched control group (post hoc tests).
Huang et al. BMC Neuroscience 2012 13:82 doi:10.1186/1471-2202-13-82