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The epidermal growth factor receptor ( EGFR ) has an essential role in multiple signaling pathways , including cell proliferation and migration , through extracellular ligand binding and subsequent activation of its intracellular tyrosine kinase ( TK ) domain .
 Chemical: tyrosine
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: tyrosine