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Analysis of protein expression using antibody microarrays and Western blotting revealed differential changes in MAP kinase - related pathways after multiple and single METH injections .
 Chemical: METH
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: METH