id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
en-wikipedia-org-43		Neurotrophin - Wikipedia			.html	text/html	4174	774	57	According to the United States National Library of Medicine's medical subject headings, the term neurotrophin may be used as a synonym for neurotrophic factor,[5] but the term neurotrophin is more generally reserved for four structurally related factors: nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3), and neurotrophin-4 (NT-4).[6] The term neurotrophic factor generally refers to these four neurotrophins, the GDNF family of ligands, and ciliary neurotrophic factor (CNTF), among other biomolecules.[6][7] Neurotrophin-6 and neurotrophin-7 also exist but are only found in zebrafish.[8] One of these is nerve growth factor (NGF or beta-NGF), a vertebrate protein that stimulates division and differentiation of sympathetic and embryonic sensory neurons.[10][11] NGF is mostly found outside the central nervous system (CNS), but slight traces have been detected in adult CNS tissues, although a physiological role for this is unknown.[9] It has also been found in several snake venoms.[12][13]	./cache/en-wikipedia-org-43.html	./txt/en-wikipedia-org-43.txt