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Here , we report the construction , expression and characterization of a recombinant streptavidin - C3 fusion protein which allows for delivery of biotin - labelled molecules into the cytosol of macrophages via enzymatically inactive C3bot1E174Q .
 Chemical: biotin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: biotin