11118
Type 1 pili are representative of a class of bacterial surface structures assembled by the conserved chaperone / usher pathway and used by uropathogenic Escherichia coli to attach to bladder cells during 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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