14714
Zebrafish embryos were exposed to pentabrominated diphenyl ethers mixture ( DE - 71 ) at concentrations of 0 , 0 . 32 , 3 . 58 , and 31 . 0 micro g / L until 15 d postfertilization .
 Chemical: pentabrominated diphenyl ethers
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: pentabrominated diphenyl ethers