12250
Ex vivo samples of human oral mucosa were exposed to Pb or BaP , and immunohistochemical staining was performed to evaluate active caspase - 3 , 8 - epi - prostaglandin F2 alpha ( 8 - epi - PGF2a ) , and 3 - nitrotyrosine ( 3 - NT ) .
 Chemical: Pb; Chemical: BaP; Chemical: 8 - epi - prostaglandin F2 alpha; Chemical: 8 - epi - PGF2a; Chemical: 3 - nitrotyrosine; Chemical: 3 - NT
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: Pb; Chemical: BaP; Chemical: 8 - epi - prostaglandin F2 alpha; Chemical: 8 - epi - PGF2a; Chemical: 3 - nitrotyrosine; Chemical: 3 - NT