Colonic organoids grown from Lgr5-EGFP-IRES-CreERT2 mice were treated with an AhR agonist (10 nM TCDD) or antagonist (10 µM CH223191) for 3 d. (B) Assessment of GFP+ stem cell percentages (n=3 replicates per treatment). Bars with different letters are significantly different (p<0.05). 