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Representative images of immunohistochemical staining for CD8 and CD68. (a) High density of CD8‐positive lymphocyte infiltration. (b) Low density of CD8‐positive lymphocyte infiltration. (c) High density of CD68‐positive macrophage infiltration. (d) Low density of CD68‐positive macrophage infiltration. Scale bar: 50 μm. CD8, cluster of differentiation 8; CD68, cluster of differentiation 68
