Interstitial cellular infiltration. IHC showed interstitial CD3 T cell amount positively correlated with rejection severity with a better contrast than H&E staining. A: grade A0 rejection, B: grade A1 rejection, C: grade A2 rejection, D: grade A3 rejection. (x200).
Cheng et al. Diagnostic Pathology 2013 8:168 doi:10.1186/1746-1596-8-168