CXCR4 (C-X-C Motif Chemokine Receptor 4): CXCR4 is a gene that codes for a chemokine receptor involved in immune responses and cell migration. It binds to its ligand, CXCL12, and regulates the trafficking of immune cells. CXCR4 is crucial for immune system function and is implicated in various diseases, including cancer and HIV infection....