SLC9A1 and heart failure: Hae-Young Lee and Seung Hyeok Seok at Seoul National University, South Korea, and co-workers examined the cardio-protective effects of the drugs on zebrafish models of diabetic heart failure.They focused on sodium-hydrogen exchanger 1 (NHE1), which regulates sodium and hydrogen levels to maintain pH balance, and is increased in the heart ventricle tissue of patients with heart failure.