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In this investigation , a dual target plasmid designated pRSETMON - 02 comprising of MON 810 maize event specific and endogenous zein gene sequences in 1 : 1 ratio in tandem was constructed and validated .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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