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Although IL - 6 can activate ERK - 1 in HepG2 cells , STAT3 transactivation and Ser ( 727 ) phosphorylation were not reduced by using the MAP kinase / ERK kinase ( MEK ) inhibitor PD98059 or by overexpression of dominant - negative Raf .
 GENE: IL - 6; GENE: ERK - 1; GENE: STAT3; GENE: MAP kinase; GENE: ERK kinase; GENE: MEK; GENE: Raf
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: IL - 6; GENE: ERK - 1; GENE: STAT3; GENE: MAP kinase; GENE: ERK kinase; GENE: MEK; GENE: Raf