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High levels of CXCL12/CXCR4 in postmortem #Parkinsons & transgenic brain tissues. α-Synuclein upregulates CXCL12 in microglia, & induces secretion of CXCL12 (via TLR4/IκB-α/NF-κB). CXCL12/CXCR4/FAK/Src/Rac1 signaling involved in microglial migratio