Atherosclerosis is a chronic disease caused by the deposition of fat, cholesterol, calcium, and other chemicals in the endothelium of arteries, resulting in the loss of arterial elasticity due to vessel thickening and sclerosis. Once thick plaque substantially blocks the arteries, it can significantly limit blood flow to the vessels serving the tissues, resulting in severe tissue damage. GemPharmatech has developed ApoE knockout models and Ldlr knockout models that can be used to study atherosclerosis and efficacy evaluation services for the related drugs.