Here, arterioles from subjects with CAD dilated to flow in the presence of the NO scavenger, cPTIO (%MD 66.1 ± 15.2, n = 4) or PEG-catalase (%MD 52.2 ± 11.8, n = 5) compared to osmotin with no inhibitors (%MD 76.2 ± 5.9, n = 6). Here, CAT is linked to coronary artery disorder.