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In vivo tumorigenic capacity of GICs was dependent on PDGF-B. (A) Tumor incidence in mice transplanted with TS1 cells treated with control or PDGF-B siRNA. Fisher exact test, *P < 0.05. (B and C) H&E staining of secondary tumors originated from control (B) or PDGF-B (C) siRNA-treated TS1 cells. Scale bar, 50 µm. (D and E) HA staining of secondary tumors originated from control (D) or PDGF-B (E) siRNA-treated TS1 cells. Scale bar, 50 µm.
