May be involved in the formation and stability of synapses as well as being involved in the clustering of nicotinic acetylcholine receptors.
Subcellular locations: Cytoplasm, Synapse, Cell membrane
In peripheral nerves, colocalizes with MAGEE1 in the Schwann cell membrane.
Highly expressed in brain, skeletal and cardiac muscles, and expressed at lower levels in lung, liver and pancreas. Isoform 2 is not expressed in cardiac muscle. Isoform 7 and isoform 8 are only expressed in muscle.