(Novus, Littleton, CO, USA), horseradish peroxidase (HRP)-linked secondary antibody (Cell Signaling Technology, Beverly, MA, USA), anti-β-actin antibody (Merck Millipore, Billerica, MA, USA), FITC-conjugated mouse anti-human CD227 (MUC1) (BD Pharmingen, San Diego, CA, USA), PE-...