4535
Moreover , acetylation of alpha - tubulin is under the control of the acetyltransferase MEC - 17 and deacetylases SIRT2 ( Sirtuin 2 ) and HDAC6 ( histone deacetylase 6 ) .
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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