APOE and hydrops fetalis: The HF diet induced significant atherosclerotic lesions in the aortic roots (Figure 10A) of ApoE−/−Arg‐II+/+ mice; this was reduced markedly in ApoE−/−Arg‐II−/− double‐knockout mice (the lesions in the thoracic and abdominal aortas on HF were too small for quantification, and the data are thus not presented).