5134
Though it transfers one methyl group at a time , presumably through a single A subunit , BcgI methyltransferase can be activated by adding extra A subunits , either individually or as part of A ( 2 ) B protomers , which indicates that it requires an assembly containing at least two A ( 2 ) B units .
 Chemical: methyl
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: methyl