This protein is associated with nerve growth. It is a major component of the motile 'growth cones' that form the tips of elongating axons. Plays a role in axonal and dendritic filopodia induction. Identified in a complex containing FGFR4, NCAM1, CDH2, PLCG1, FRS2, SRC, SHC1, GAP43 and CTTN (By similarity). Interacts (via IQ domain) with calmodulin (By similarity). Binds calmodulin with a greater affinity in the absence of Ca(2+) than in its presence (By similarity). Cytoplasmic surface of growth cone and synaptic plasma membranes. Phosphorylated (By similarity). Phosphorylation of this protein by a protein kinase C is specifically correlated with certain forms of synaptic plasticity (By similarity). Palmitoylated by ZDHHC3 (By similarity). Palmitoylation is regulated by ARF6 and is essential for plasma membrane association and axonal and dendritic filopodia induction (PubMed:14978216). Deacylated by LYPLA2 (PubMed:21152083). Belongs to the neuromodulin family. Gap-43 entry