The protein encoded by this gene is a type I membrane protein and member of the immunoglobulin superfamily. It is thought to be involved in the process of myelination. It is a lectin that binds to sialylated glycoconjugates and mediates certain myelin-neuron cell-cell interactions. Three alternatively spliced transcripts encoding different isoforms have been described for this gene. [provided by RefSeq, Nov 2010],GMA, S-MAG, SIGLEC-4A, SIGLEC4A, SPG75,Cell Adhesion,Cell Biology & Developmental Biology,Neuroscience,MAG