The series of molecular signals initiated by an extracellular calcitonin gene-related peptide (CGRP) combining with a calcitonin gene-related peptide receptor on the surface of the target cell. Calcitonin gene-related peptide receptors may form dimers, trimers or tetramers. [GOC:bhm, PMID:10882736]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process