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In addition , mithracycin A protected PC12 cells from oxidative stress caused by MPP + by specifically inhibiting the expression of Sp1 .
 Chemical: mithracycin A; Chemical: MPP +
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: mithracycin A; Chemical: MPP +