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Immunohistochemistry for chymase and tryptase in human tumor biopsies. Both proteases display increased immunoreactivity in cholangiocarcinoma samples compared to nonmalignant samples. *P<0.05 vs. nonmalignant. Data are mean ± SEM of 3 experiments. Org. magnification ×40. Unpublished observations from Alpini & Francis et al. 2010
