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We used bisulfite - PCR pyrosequencing to quantitate DNA methylation in long interspersed nuclear element - 1 ( LINE - 1 ) and O ( 6 ) - methylguanine - DNA methyltransferase ( MGMT ) .
 Chemical: bisulfite; Chemical: O ( 6 ) - methylguanine
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: bisulfite; Chemical: O ( 6 ) - methylguanine