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To investigate the effects of beta - ionone on apoptosis initiation and its possible mechanisms of action , we qualified cell apoptosis , proteins related to apoptosis and a phosphatidylinositol 3 - kinase ( PI3K ) - AKT pathway in human gastric adenocarcinoma cancer SGC - 7901 cells .
 Chemical: beta - ionone; Chemical: phosphatidylinositol
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: beta - ionone; Chemical: phosphatidylinositol