Calcium assay in mouse glomerular endothelial cells (MGECs). Calcium assay was performed using Fluo-4 NW assay kit. Values are mean ± SE, n = 8 or 0; *,†,γ,δ,ϕP < 0.05. Prb, probenecid, an inhibitor of organic anion transporters; RFU, relative fluorescence units.