Description: Glial Cell derived Neurotrophic Factor (GDNF), a member of the TGFß superfamily, is a neurotrophic factor that promotes the survival of various neuronal populations in both the central and peripheral nervous systems during their development. Neuronal subpopulations affected by GDNF include motor neurons, midbrain dopaminergic neurons and Purkinje cells. GDNF is conserved across mammalian species with human and rat orthologs sharing approximately 93% amino acid sequence identity. E. coli-produced recombinant human GDNF is a disulfide-linked, non-glycosylated homodimer composed of two 135 amino acid polypeptides.