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Expression of protein tyrosine kinase 7 (PTK7) in tumor samples from 10 patients with esophageal squamous cell carcinoma. (a) Levels of PTK7 mRNA determined by RT‐PCR. The GAPDH mRNA levels are shown for normalization. Numbers 1–20 are patient identifiers. (b) Western blot showing PTK7 protein levels. β‐Actin levels are shown for normalization. Numbers 1–10 are patient identifiers. N, healthy esophageal epithelium, adjacent to the tumor; T, tumor tissue sample.
