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Plasma ammonium level ranged from 248 to 2387 microg % ( mean : 626 + / - 431 microg % ) .
 Chemical: ammonium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: ammonium