Probable ligand for integrin in the brain. This is a non catalytic metalloprotease-like protein. Can bind to LGI1 and LGI4. Expressed predominantly in brain. Slightly detected or not at all in other tissues. A conserved motif [AVN[ED]CD] within the disintegrin-like domain could be involved in the binding to the integrin receptor. The precursor is cleaved by a furin endopeptidase. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay.