Product Description: The product contains the polyhedrin protein co-crystalized with Human NT-4. Neurotrophin-4 (NT-4), also known as NT-5, is a neurotrophic factor and a member of the NGF family. NT-4 is expressed in the prostate, thymus, placenta, and skeletal muscle. NT-4 promotes the development and survival of peripheral and CNS neurons and the proliferation of keratinocyte.