8302
Under UV - irradiation , E . coli bacteria exposed to CPEs and OPEs showed covalent modifications and damages to both cellular protein and plasmid DNA , likely through oxidative pathways mediated by singlet oxygen and subsequent reactive oxygen species sensitized by the CPE and OPE compounds .
 Chemical: OPEs; Chemical: oxygen; Chemical: oxygen; Chemical: OPE
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: OPEs; Chemical: oxygen; Chemical: oxygen; Chemical: OPE