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Representative images of immunohistochemical expression of fibroblast‐activating protein (FAP) in tumor cells and cancer‐associated fibroblasts (CAFs). (a) Low expression in both tumor cells and CAFs. (b) Low expression in tumor cells and high expression in CAFs. (c) High expression in tumor cells and low expression in CAFs. (d) High expression in both tumor cells and CAFs. Insets show high power view images, respectively
