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Immunoreactivity for 15-PGDH protein in adjacent noncancerous gastric tissues and GC tissues. 15-PGDH protein in adjacent noncancerous gastric tissues was mainly observed in cytoplasm of epithelial cells: A negative; B low expression; C high expression (original magnification, ×200). 15-PGDH protein in GC tissues was observed in cytoplasm of cancer cells: D negative; E low expression; F high expression (original magnification, ×200).
