7547
Comparisons are also drawn with physiologically important structural fibres that share common characteristics at the molecular and the nano - scale , including intermediate filament ( IF ) proteins from the cell cytoskeleton , myosins from motor proteins , and fibrin from blood clot .
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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:
 None