5464
The use of ATR - FTIR microscopy confirmed the presence of these structural environments and enabled their location in the core of the thread ( collagen helices and antiparallel beta - sheets ) or its cuticle ( unordered structures ) .
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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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