17097
Mechanistically , the decreased expression of Mat1a , Ahcy , and Mthfd1 was linked to a reduced level and promoter binding of transcription factor CCAAT / enhancer binding protein beta ( CEBP beta ) , which directly regulates their transcription .
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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:
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