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While pushing living cells with the AFM tip provides a means to quantify their mechanical properties and examine their response to nanoscale forces , pulling single surface proteins with a functionalized tip allows one to understand their role in sensing and adhesion .
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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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