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The epidermal growth factor ( EGF ) receptor , which exhibits intrinsic protein tyrosine kinase activity , undergoes a rapid , intramolecular self - phosphorylation reaction following EGF activation .
 GENE: epidermal growth factor ( EGF ) receptor; GENE: protein tyrosine kinase; GENE: EGF
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: epidermal growth factor ( EGF ) receptor; GENE: protein tyrosine kinase; GENE: EGF