PPP1R12A and atrial fibrillation: The study also compared mononuclear cells’ MYPT-1 phosphorylation status and Cx40 level found in both AF and sinus rhythm dialysis patients to those found in a group of healthy individuals used as the control group and evaluated the effect of fasudil, a ROCK inhibitor, on MYPT-1 phosphorylation and Cx40 expression.