4422
On the other hand , the exposure of the crayfish to (1/4) 96 h - LC ( 50 ) ( 0 . 36 mg l ( - 1 ) ) of ethion caused extensive ultrastructural alterations to both hepatopancreas and gill epithelial cells .
 Chemical: ethion
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: ethion