26655
Leptin directly repressed agouti - related peptide ( AgRP ) mRNA levels , but induced urocortin - 2 ( UCN2 ) , insulin receptor substrate - 1 ( IRS1 ) , IRS2 , and IR transcription , through leptin - mediated phosphatidylinositol - 3 - kinase ( PI3K ) / Akt activation .
 Chemical: phosphatidylinositol
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: phosphatidylinositol 
Answer:
 Chemical: phosphatidylinositol