28188
Polybrominated diphenyl ethers ( PBDEs ) have been shown to affect the estrogen receptor ( ER ) signaling pathway , and one of the proposed disruption mechanisms is direct binding of hydroxylated PBDE ( OH - PBDE ) to ER .
 Chemical: Polybrominated diphenyl ethers; Chemical: PBDEs; Chemical: estrogen; Chemical: PBDE; Chemical: OH - PBDE
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Polybrominated diphenyl ethers, PBDEs, estrogen, PBDE, OH - PBDE 
Answer:
 Chemical: Polybrominated diphenyl ethers; Chemical: PBDEs; Chemical: estrogen; Chemical: PBDE; Chemical: OH - PBDE