Medical Definition of neurotrophic factor
: any of a group of neuropeptides (such as nerve growth factor) that regulate the growth, differentiation, and survival of neurons … transplantation of neural precursor cells into the spinal cord of patients with amyotrophic lateral sclerosis may be beneficial as a platform for delivering neurotrophic factors that promote neuron differentiation and growth.—Robert H. Brown Jr., Science, 29 Aug. 2008—called also neurotrophin
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