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In the present study we have evaluated the effects of exposure ( 30 days ) to sub - lethal concentrations of arsenic ( 5 mu M As2O3 ) in the teleost fish gilthead seabream ( Sparus aurata ) , with special emphasis in the innate immune response .
 Chemical: arsenic; Chemical: As2O3
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: arsenic; Chemical: As2O3