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Identifying stromal Tumor Infiltrating Lymphocyte (TIL) regions in a H&E-stained WSI of breast cancer. (A) H&E-stained WSI of breast cancer. (B) Example of a region of tissue. (C) Example of stromal TILs (green solid arrow) and cells that are no TILs (red dotted arrow). The image shows how it can be challenging to visually differentiate TILs from other cells. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
