CCL14 and acute kidney injury: Recently, the RUBY study described the discovery of urinary C–C motif chemokine ligand-14 (CCL14) to predict the development of persistent severe AKI, defined as Kidney Disease: Improving Global Outcomes (KDIGO) stage 3 AKI for 72 h or greater, among 331 critically ill patients with KDIGO stage 2 or greater AKI (AUC 0.83) [6].