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Differentiation of neural progenitor cells ( NPCs ) into mature neurons was demonstrated by co - culturing microparticles with cells in a medium containing collagenase which enabled the release of encapsulated GDNF - CBP , signaling the differentiation of NPCs into microtubule - associated protein 2 ( MAP2 ) - expressing neurons .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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