21404
Furthermore , CK induced activation of nuclear erythroid 2 - related factor 2 ( Nrf2 ) - mediated antioxidant enzymes such as gamma - glutamylcysteine synthetase ( gamma - GCS ) , heme oxygenase - 1 ( HO - 1 ) , NAD ( P ) H quinone oxidoreductase 1 ( NQO1 ) , and glutathione - S - transferase ( GST ) in HepG2 cells .
 Chemical: gamma - glutamylcysteine; Chemical: heme; Chemical: NAD ( P ) H; Chemical: quinone; Chemical: glutathione; Chemical: S
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: gamma - glutamylcysteine; Chemical: heme; Chemical: NAD ( P ) H; Chemical: quinone; Chemical: glutathione; Chemical: S