Recombinant ZNT-7 was able to bind to the human p75 neurotrophin receptor/NGFR and to induce tyrosine phosphorylation of the rat NTRK1/TRKA receptor tyrosine kinase, albeit less efficiently than rat NGF. ZNT-7 did not interact with rat NTRK2/TRKB or NTRK3/TRKC, indicating a similar receptor specificity as NGF. Belongs to the NGF-beta family.