6624
Along with ERs , mixed - lineage leukemia ( MLL ) histone methylases , especially MLL1 and MLL2 , play key roles in E2 - mediated SR - B1 activation .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None