The liver teratomas and the teratoma tissue sections were stained by hematoxylin and eosin following transplantation with control ESCs and DKK1-treated ESCs. (A) Liver teratoma derived from control ESCs 4 weeks post transplantation. The middle column is a magnetic resonance imaging scan. (B) Histogram of the tumor weight of liver teratomas. Data are presented as the mean ± standard deviation. *P<0.05 vs. control. ESC, embryonic stem cell; DKK1, dickkopf Wnt signaling pathway inhibitor 1. (C) Hematoxylin and eosin staining for teratomas derived from control ESCs and DKK1-treated ESCs (magnification, x100). Ganglion, glandular and cartilage tissues in teratomas derived from control and DKK1-treated ESCs are presented (magnification, ×400). ESC, embryonic stem cell; DKK1, dickkopf Wnt signaling pathway inhibitor 1.