The function of OLFM1 (olfactomedin 1, ENSG00000130558) is as follows. Contributes to the regulation of axonal growth in the embryonic and adult central nervous system by inhibiting interactions between RTN4R and LINGO1. Inhibits RTN4R-mediated axon growth cone collapse (By similarity). May play an important role in regulating the production of neural crest cells by the neural tube (By similarity). May be required for normal responses to olfactory stimuli (By similarity). {ECO:0000250|UniProtKB:O88998, ECO:0000250|UniProtKB:Q9IAK4}.