The function of ANOS1 (anosmin 1, Ensembl gene identifier ENSG00000011201) is as follows. Has a dual branch-promoting and guidance activity, which may play an important role in the patterning of mitral and tufted cell collaterals to the olfactory cortex (By similarity). Chemoattractant for fetal olfactory epithelial cells. {ECO:0000250, ECO:0000269|PubMed:19696444}.