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Abstract CXC chemokine receptor 4 (CXCR4) and its chemokine ligand CXCL12 are crucial to embryonic development, bone marrow retention of hematopoietic progenitor cells, cancer metastasis, angiogenesis and HIV-1 infection. Yet the structural basis for CXCR4 recognition of full-length CXCL12 remains unknown despite available structures of CXCR4 in complex with small molecule antagonists and a viral chemokine.
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