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Interestingly , significant progress was noted with the supplementation of MKA by an improvement of the acetylcholine ( ACh ) levels and a reduction in the acetylcholinesterase ( AChE ) activity in aged mouse brain .
 Chemical: acetylcholine; Chemical: ACh
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: acetylcholine; Chemical: ACh