11. Muscle spindle derived GDNF neurotrophic factors must also be present for postnatal survival. 12. Neurotrophic fungal isolates include L-theanine, tricholomalides, scabronines, termitomycesphins.13. This gene encodes a highly conserved neurotrophic factor. 14. One factor from each neurotrophic family was used. 15. DNA methylation can also affect expression of BDNF ( brain derived neurotrophic factor ). 16. Neurotrophic factors have a wide variety of functions in the human body, MacKay said.17. We continue to believe that neurotrophic factors have potential to benefit patients with neurological diseases. 18. The glass cones are laced with neurotrophic chemicals extracted from the patients'own knees. 19. Brain-derived neurotrophic factor ( BDNF ) is under investigation as a possible mechanism. 20. Other neurotrophic factor proteomes are needed to guide neurons to each other to create synapses.