22798
By combining the bottom - up functionality of biological systems with the top - down handling capabilities of micro - electromechanical systems technology , highly selective molecular recognition and motor - protein - based transport is integrated in a microfluidic channel network .
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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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