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Immunohistochemical stain for 15-hydroxyprostaglandin dehydronase (15-PGDH). Normal gastric glands express 15-PGDH (A, ×100). Gastric cancer cells show variable expression of 15-PGDH: loss of expression (B, ×100), preserved expression (C, ×100), and overexpression (D, ×100).
