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Silent information regulator 2 ( Sir2 ) enzymes or sirtuins are a family of evolutionarily conserved intracellular protein deacetylases that can catalyze the acetyl group removal from the specific N epsilon - acetyl - lysine ( AcK ) side chains on a variety of proteins from all kingdoms of life .
 Chemical: acetyl; Chemical: N epsilon - acetyl - lysine
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: acetyl; Chemical: N epsilon - acetyl - lysine