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FAP expression in human OS cell lines and tissues. (A) Polymerase chain reaction analysis of FAP expression within a panel of OS cell lines. (B) Immunohistochemical staining of FAP in human OS tissues as follows: B1, background bone tissue; and B2, 3 and 4, OS tissues. All images were captured under a microscope (magnification, ×200). FAP, fibroblast activation protein; OS, osteosarcoma.
