The Biosensis Mature BDNF/proBDNF Combo Rapid ELISA Kit combines individual, but complementary ELISA kits for the two most important BDNF isoforms: Mature BDNF (BEK-2211) and full-length proBDNF (BEK-2217). Both kits are sandwich ELISAs, useful for the quantification of mature BDNF and proBDNF in less than 4 hours in cell culture supernatants, serum, plasma (citrate), cell lysates and brain extracts, with a simplified protocol and no loss of sensitivity or specificity. The proBDNF kit (BEK-2217) employs a polyclonal capture antibody for dependable and reliable detection.