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Cellular infiltrates in acute cellular rejection after kidney transplantation. A: Hematoxylin Eosin (HE) staining showing cellular infiltrates. B: aspecific background staining with C4d. C–E: co-localization of T helper cells, CD3- and CD4-positive cells in C and D, and B cells, CD20-positive cells in E. Magnification A–B: 20×, C–E: 10×, insert: 20×
