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Comparison of Ki67 staining in (A) the engraftment syndrome (ES) with (B) acute cellular rejection, type II (ACR2). Ki67 stains most of the nuclei of intracapillary cells (peritubular capillaries and glomeruli) in ES, but in ACR2, Ki67 is mostly present in the cells infiltrating the interstitium and tubules. (C) Loss of CD34 staining of the peritubular capillary (PTC) endothelium in the ES.
