The Biosensis NGF Rapid enzyme-linked immunosorbent assay (ELISA) Kit is a sandwich ELISA that allows the quantification of rat NGF in less than 3 hours in cell culture supernatants, serum, and brain extracts. This NGF ELISA kit is designed to measure rat NGF and thus employs a recombinant rat NGF protein. Due to a high degree of NGF sequence homology, the antibodies used in this kit will also detect NGF from other species including human and mouse.