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Food plant species are particularly attractive as hosts for in vitro protein production : the risk of transgene escape and food chain contamination is eliminated using containment facilities , while regulatory approval for oral delivery of drugs may be easier than if non - edible species were used .
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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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