THE PRESENT INVENTION PROVIDES A BINDING MOLECULE WHICH IS CAPABLE OF BINDING TO THE HUMAN NOGOA POLYPEPTIDE OR HUMAN NiG WITH A DISSOCIATION CONSTANT <; 1000 nM, A POLYNUCLEOTIDE ENCODING SUCH BINDING MOLECULE; AN EXPRESSION VECTOR COMPRISING SAID POLYNUCLEOTIDE; AN EXPRESSION SYSTEM COMPRISING A POLYNUCLEOTIDE CAPABLE OF PRODUCING A BINDING MOLECULE; AN ISOLATED HOST CELL WHICH COMPRISES AN EXPRESSION SYSTEM AS DEFINED ABOVE; THE USE OF SUCH BINDING MOLECULE AS A PHARMACEUTICAL, ESPECIALLY IN THE TREATMENT OF A DISEASE OF THE PERIPHERAL (PNS) AND/OR CENTRAL (CNS) NERVOUS SYSTEM; A PHARMACEUTICAL COMPOSITION COMPRISING SAID BINDING MOLECULE; AND A METHOD OF TREATMENT OF A DISEASE OF THE PERIPHERAL (PNS) AND/OR CENTRAL (CNS) NERVOUS SYSTEM.