Within the AKI group (n = 20), acute kidney injury was attributed to ischemia in 7 patients, nephrotoxins in 4, sepsis in 1, and multifactorial causes in 8 (Table 2); KLK1 excretion did not vary by AKI causal group (ANOVA p = 0.83). The gene discussed is KLK1; the disease is acute kidney injury.