Anti-norrin antibodies enable researchers to detect and measure the norrin antigen in biological samples. This target is a reported synonym of the NDP gene, which encodes norrin cystine knot growth factor NDP. This protein is known to function in angiogenesis and the Wnt signaling pathway, among other biological roles. The human version of norrin has a canonical amino acid length of 133 residues and a protein mass of 15 kilodaltons. It is reported to be a secreted protein. Other names for this target antigen include EVR2, FEVR, and ND.