Receptor tyrosine kinase(RTK) 调节机体生理活动 激素通过受体酪氨酸激酶途径 kinase MAPKK MAPK kinase Thr Mitogen-activated protein kinase Nucleus ohosphorylation ATF-2 Gene transcription Protein synthesis 调节机体生理活动 激素通过受体酪氨酸激酶途径