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Taken together , these data suggest that acquisition of extraordinary levels of copper is an important factor in the survivability of the pathogen in the copper - deplete environment of infection , and effective copper concentration may play an important role in the pathogenesis of C . neoformans .
 Chemical: copper; Chemical: copper; Chemical: copper
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: copper; Chemical: copper; Chemical: copper