Filing Date: 2001-09-06.--Priority Data: US 60/230,449 (2000-09-06)A polynucleotide comprising a nucleotide sequence which encodes the polypeptide whose amino acid sequence is given in Figure (1b) or Figure (11) or a fragment or variant or fusion thereof or a fusion of said fragment or variant, or its complement, the polypeptide encoded by said polynucleotide and fragments or variants or fusions thereof, antibodies specifically binding the said polypeptide or fragments or variants or fusions thereof. The invention further comprises methods of producing said polypeptide and antibodies and uses thereof.