Cell adhesion molecule that mediates homophilic cell-cell adhesion in a Ca(2+)-independent manner. Promotes neurite outgrowth in hippocampal neurons. {ECO:0000269|PubMed:18227064, ECO:0000269|PubMed:18585462}. This is the function of ENSG00000165379 (LRFN5, leucine rich repeat and fibronectin type III domain containing 5).