The function of FARP1 (FERM, ARH/RhoGEF and pleckstrin domain protein 1, Ensembl gene identifier ENSG00000152767) is as follows. Functions as a guanine nucleotide exchange factor for RAC1. May play a role in semaphorin signaling. Plays a role in the assembly and disassembly of dendritic filopodia, the formation of dendritic spines, regulation of dendrite length and ultimately the formation of synapses (By similarity). .