5132
Although most DNA methyltransferases operate at both unmethylated and hemi - methylated sites , BcgI methyltransferase is only effective at hemi - methylated sites , where the nuclease component is inactive .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None