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Drinking rate , measured with radiolabeled polyethylene glycol - 4000 , was about 25 times greater in 16ppt - acclimated killifish relative to FW - acclimated animals .
 Chemical: polyethylene glycol - 4000
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: polyethylene glycol - 4000