WST-1 viability assay on PIPLC-treated EA.hy926 cells. Percentage of nonviable PIPLC-treated EA.hy926 cells among different disease entities (data are presented as mean with standard error of the mean [SEM]). aPIGN, atypical postinfectious glomerulonephritis; Ecu-aHUS, atypical hemolytic uremic syndrome treated with eculizumab; Stec-HUS: Shiga-toxin–associated hemolytic uremic syndrome.