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To aid in the development of an inexpensive miniaturized RNAi screening platform , we have developed a two part microfluidic system for patterning and screening gene targets on - chip to examine cellular pathways involved in virus entry and infection .
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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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