In vitro research [54] has revealed that the normal arterial WSS ranges from 1 to 7 Pa, and a WSS <1 Pa can promote the expression of atherosclerosis-related genes such as platelet-derived growth factor-A (PDGF-A) and vascular cell adhesion molecule-1 (VCAM-1); the transfer of atherosclerotic substances; and the adhesion of monocytes to the endothelium. This evidence concerns the gene VCAM1 and atherosclerosis.