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The pathways by which palbinone ( PB ) isolated from P . suffruticosa mediates heme oxygenase - 1 ( HO - 1 ) induction were investigated using the specific inhibitors for PI3K and mitogen activated protein kinases pathways .
 Chemical: palbinone; Chemical: heme
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: palbinone; Chemical: heme