The function of SIGLEC9 (sialic acid binding Ig like lectin 9, Ensembl gene identifier ENSG00000129450) is as follows. Putative adhesion molecule that mediates sialic-acid dependent binding to cells. Preferentially binds to alpha-2,3- or alpha-2,6-linked sialic acid. The sialic acid recognition site may be masked by cis interactions with sialic acids on the same cell surface.