1377
Substantial evidence supports a critical role for the activation of the Raf - 1 / MEK / mitogen - activated protein kinase pathway in oncogenic Ras - mediated transformation .
 GENE: Raf - 1; GENE: MEK; GENE: mitogen - activated protein kinase; GENE: Ras
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: Raf - 1; GENE: MEK; GENE: mitogen - activated protein kinase; GENE: Ras