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Genetically modified ( GM ) papaya ( Carica papaya L . ) line 55 - 1 ( 55 - 1 ) , which is resistant to papaya ringspot virus infection , has been marketed internationally .
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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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