25208
NAC treatment caused a reduction of extracellular medium pH to acidic and an increase in Akt phosphorylation , after which the replacement with NAC - free medium returned them to control levels within 24h .
 Chemical: NAC; Chemical: NAC
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: NAC; Chemical: NAC