24217
We recruited 82 PAH - exposed workers and 62 unexposed controls , assessed exposure levels by urinary 1 - hydroxypyrene , and measured genetic damages by comet assay , bleomycin sensitivity , and micronucleus assay .
 Chemical: PAH; Chemical: 1 - hydroxypyrene; Chemical: bleomycin
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: PAH; Chemical: 1 - hydroxypyrene; Chemical: bleomycin