12841
These results suggest that spermidine mediates cell proliferation and survival downstream of PI3K / Akt and indicate that these two biochemical pathways control each other ' s activities , highlighting a mechanism by which small molecule metabolism feeds back to regulate kinase signalling .
 Chemical: spermidine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: spermidine 
Answer:
 Chemical: spermidine