Many investigators have suspected that regulation of renin-an enzyme that mediates the extracellular fluids volume in blood-plays a key role in hypertension, but this piece reports that collaborators in Britain, Australia and Poland have identified microRNA’s for the first time that are involved in the renin-angiotensin system.  Tissue for this work came from the Silesian Renal Tissue Bank at the Medical University of Silesia in Zabrze, Poland.  MORE