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MHC-1 staining in primary tumor and metastatic lymph node in gastric cancer. (a) Primary tumor (no MHC-1 staining). (b) Primary tumor (low MHC-1 staining). (c) Primary tumor (high MHC-1 staining). (d) Metastatic tumor (no MHC-1 staining). (e) Metastatic tumor (low MHC-1 staining). (f) Metastatic tumor (high MHC-1 staining). All images ×100 magnification.
