highly significantp < 0.00000001
Furthermore, we found a highly significant correlation (Spearman’s r = 0.76; p < 0.00000001) between uC5b-9/uCre and tissue glomerular C3 fragment deposition, measured by anti-C3 fragment immunostaining ( Figure S13 B), suggesting that uC5b-9/uCre is a urine biomarker of kidney tissue complement activation.