So we can say that IGF receptor is a potential mitogen.IGFBP is a transportation protein and the high concentration in blood can depress the biological action of IGF.

• 胰岛素样生长因子结合蛋白(IGFBP)主要是起运输作用，通过与IGF相结合而产生生物效应，血浆高浓度的IGFBP可以降低IGF的生物作用。