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Although the presence and distribution of polychlorinated biphenyls ( PCBs ) in Arctic marine environments has been well documented , the implications for the health of biota are poorly understood .
 Chemical: polychlorinated biphenyls; Chemical: PCBs
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: polychlorinated biphenyls; Chemical: PCBs