LDLR and atherosclerosis: Two classical transgenic mice models’ creation on the background of the C57BL/6 line was a ‘breakthrough’ in the history of atherosclerosis research in the late 20th century: apoprotein E-deficient (Apoe−/−) and low-density lipoprotein receptor (LDLR)-deficient (Ldlr−/−) [6,7].