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While much research has been done on how plants , free-living microbial decomposers , and soil minerals affect this pool of carbon , it is recently coming to light that mycorrhizal fungi - symbiotic fungi that associate with roots of almost all living plants - may play an important role in maintaining this pool as well .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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