Immunogen sequence: PALLEKVFQY IDLHQDEFVQ TLKEWVAIES DSVQPVPRFR QELFRMMAVA ADTLQRLGAR VASVDMGPQQ LPDGQSLPIP PVILAELGSD PTKGTVCFYG HL. This gene encodes a member of the M20 metalloprotease family. The encoded protein is specifically expressed in the brain