ID1 and neoplasm: It has been reported that EPCs contribute about 90% to vascularization in lymphomas grown in angiogenesis-defective Id-mutant mice in which implanted tumors rapidly regress in association with poor development of tumor neovessels[32].In this study, we observed that sympathetic neurotransmitter NE increased the mobilization of EPCs through α adrenoceptor and β 2 adrenoceptor.