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Although the most popular mode of nanopore sensing is based upon what has come to be known as ionic - current blockade sensing , there is a vast , growing literature based around exploring alternative detection techniques to further expand on the versatility of the sensors .
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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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