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In the 1990s there was a tremendous mood of optimism among pharmaceutical scientists that identification of disease - associated variations in the human genome would result in a surge of new drug targets ( the ' gene - to - drug ' mantra ) .
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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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