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Rg1 attenuated the A beta 25 - 35 - associated mitochondrial apoptotic events , accompanied by inhibiting HIF - 1 alpha expression followed by intracellular reactive nitrogen species generation , and protein nitrotyrosination .
 Chemical: Rg1; Chemical: nitrogen
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: Rg1; Chemical: nitrogen