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Impact of presence or absence of C4d and donor-specific antibody (DSA) on kidney allograft survival after for-cause biopsy. Both C4d positivity and the presence of detectable DSA increased the relative risk of graft failure with the best prognosis in the C4d−/DSA− group and the worst graft survival in the C4d+/DSA+ group. (Figures created from data in Gourishankar et al. 2010.)
