The Biosensis Mature BDNF Rapid enzyme-linked immunosorbent assay (ELISA) Kit is a sandwich ELISA that allows the quantification of mature BDNF in less than 3 hours in cell culture supernatants, serum, plasma (citrate and EDTA), pig serum, cell lysates, brain extracts, human milk and Sheep CSF. This Mature BDNF ELISA kit employs a recombinant human mature BDNF standard approved by the World Health Organization. The amino acid sequence of mature BDNF is identical for human, mouse, rat and a number of other species. This kit therefore is suitable to measure mature BDNF in all these species and uses the same antibodies and antigen.