2047
This view therefore focuses on in vitro models and innovative experimental approaches for functional DNT testing , ranging from optical and electrophysiological measurements of intra - and intercellular signaling in neural stem / progenitor cells to measurements of network activity in neuronal networks using multielectrode arrays .
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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:
 None