Effects of dmPGE₂ or an EP4 agonist on the regulation of β-catenin. (A) Immunoblot analysis of GSK-3β phosphorylation (Ser9) in Lin^–c-Kit⁺ cells (left panel). Densitometry analysis of the immunoblot is shown in the right panel. Representative data from 2 independent experiments are shown. (B) Immunoblot analysis of GSK-3β phosphorylation (Ser9) in Lin^–c-Kit⁺ cells (left panel). Densitometry analysis of the immunoblot is shown in the right panel. (C) Immunoblot analysis of β-catenin phosphorylation (Ser675) in Lin^–c-Kit⁺ cells (left panel). Densitometry analysis of the immunoblot is shown in the right panel. Representative data from 3 independent experiments are shown.