The series of molecular signals initiated by the binding of the C-X-C chemokine CXCL12 to a C-X-C chemokine type 4 receptor (CXCR4) on the surface of a target cell, and ending with the regulation of a downstream cellular process, e.g. transcription. [GOC:nhn]
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M5: Ontology GO: Gene Ontology GO:BP: GO Biological Process