15238
Among them , the PI3K - Akt - mTOR axis , in particular the serine / threonine kinase Akt , is recognized as a key player .
 Chemical: serine; Chemical: threonine
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: serine; Chemical: threonine