Figure 2 Villin, cytokeratin 4 (CK4), EpCAM, and β‐actin Western blotting performed on tissue protein lysates prepared from normal oesophageal squamous mucosal samples (S1–11), normal gastric mucosal samples (G1–5), and BM samples (B1–10). The numbers used to label the samples do not necessarily match those used in fig 1. Also shown are normal colonic (Col) and oesophageal squamous (Sq) mucosal lysates used as positive controls for the blotting. CK4 is a marker of (epi)basal squamous cells 10 and thus was not expected to be expressed in either the gastric or BM samples.