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This paper describes , for the first time , the immunotoxicological effects of arsenic exposure in the gilthead seabream , which is a species with the largest production in Mediterranean aquaculture .
 Chemical: arsenic
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