The function of LRFN1 (leucine rich repeat and fibronectin type III domain containing 1, Ensembl gene identifier ENSG00000128011) is as follows. Promotes neurite outgrowth in hippocampal neurons. Involved in the regulation and maintenance of excitatory synapses. Induces the clustering of excitatory postsynaptic proteins, including DLG4, DLGAP1, GRIA1 and GRIN1 (By similarity). .