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γH2AX foci in a mouse model of peritoneal metastasis of gastric cancer (PMGC). (a) γH2AX foci in PMGC cells at 6 h post‐injection with PBS, unlabeled trastuzumab (Tras), or 1 MBq of astatine‐211‐labeled trastuzumab (211At‐tras). Scale bar = 20 μm. (b) Human epidermal growth factor receptor 2 (HER2) and γH2AX foci in PMGC cells at 3 h post‐injection with 1 MBq 211At‐tras. Scale bar = 20 μm.
