Fundamental studies have determined that midgut of insect is the major site of cholesterol absorption and conversion . After transport by vascular lipoprotein in hemolymph cholesterol is consumed by the prothoracic glands .

中肠是吸收转化胆固醇的主要部位，然后通过 血.淋巴中的脂蛋白，运送到前 胸腺转化利用；