15179
The increase in the tyrosinase mRNA expression was most likely due to the inhibited mitogen - activated protein kinase phosphorylated extracellular signal - regulated kinases 1 and 2 activation .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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