NPHS2 and acute kidney injury: In the AKI horse group, the mean values of podocin concentration for the subsequent stages of AKI were: 4.3 SD 5.9 ng/ml for VAKI stage 0, 0.4 SD 0.2 ng/ml for stage 1, 2.4 SD 1.8 for stage 2 and 17.9 SD 2.9 for VAKI stage 3.