Immunogen sequence: EAEHISNYTA LLLSRDGRTL YVGAREALFA LSSNLSFLPG GEYQELLWGA DAEKKQQCSF KGKDPQRDCQ NYIKILLPLS GSHLFTCGTA AFSPMCTYIN MENFTLARDE KGNVLLEDGK GRCPFDPNFK STALVVDGEL YTGTVSSF. Inhibits axonal extension by providing local signals to specify territ