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In most liver samples and all muscle samples , estimates of organic Hg from the proposed method were indiscernible from direct speciation measurements of methylmercury ( 99 % +/- 6 % ) .
 Hg, methylmercury
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Hg, methylmercury