The expressions of CYP19A1, ERα, ERβ, and GPR30 in cholangiocyte (MMNK1) and CCA (KKU-100 and KKU-213) cell lines. a Relative CYP19A1 mRNA expression levels detected by real-time PCR. *P value < 0.05 compared to MMNK1. b CYP19A1, ERα, ERβ, and GPR30 protein expressions detected by immunocytochemistry. Positive staining results were represented in brown color