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Here we constructed killed recombinant Bacillus subtilis spores ( SA1 ) that expressed streptavidin as a chimeric fusion to the spore coat protein CotB and used the spores as bioparticle carrier .
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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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