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Representative examples of the claudin 18.2 (CLDN18.2) protein. (A) CLDN18.2 protein negativity in pancreatic adenocarcinoma (score 0). (B) Weak membranous staining with CLDN18.2 protein (score 1). (C) Moderate membranous staining with CLDN18.2 protein (score 2). (D) Strong membranous staining with CLDN18.2 protein (score 3) (CLDN18.2 DAB ×100). DAB = 3,3′-diaminobenzidine.
