Task: Answer Verification
Input (English): Question: Does cXCL12 attract CXCR4+ human metastatic neuroblastoma cells : clinical implications?
Answer: These results show unambiguously that CXCR4 expressed in human metastatic neuroblastoma cells is not functional and do not support the clinical use of CXCR4 antagonists to prevent neuroblastoma metastasis.
Output (English): no