48441
Measurements of plant carbon allocation to mycorrhizal fungi have been estimated to be 5-20 % of total plant carbon uptake , and in some ecosystems the biomass of mycorrhizal fungi can be comparable to the biomass of fine roots .
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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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