Real-time PCR analysis of miRNA candidates in sera from previously aflatoxin-exposed and aflatoxin plus CDDO-Im co-exposed animals (n=10). Error bars denote mean ± SD. Dotted line at y=36 indicates limit of quantitation. Difference between treatment groups: n.s., not significant; *, p<0.05; **, p<0.005, ***, p<0.001.