24222
Among PAH - exposed workers , LINE - 1 and MGMT methylation levels ( with CpG site specificity ) were significantly lowered .
 Chemical: PAH; Chemical: CpG
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: CpG