AQP2 and acute kidney injury: When using antibody 19-65-1, we observed similar results: the median ratio of principal cell-specific AQP2 abundance in urinary extracellular vesicles was significantly higher in deceased-donor recipients with acute kidney injury compared to immediate allograft function (median 1.99; IQR 1.00 to 2.82; vs. median 1.05; IQR 0.67 to 1.79; p < 0.01 by Mann–Whitney test).