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To better understand the post - polyketide synthase ( PKS ) modification steps in the biosynthetic pathway of FST , we constructed and characterized three post - PKS modification gene mutants of fosG , fosK , and fosM by knockout inactivation in S . pulveraceus .
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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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