2558
Each fusion leads , in principle , to the same effect : The ret tyrosine kinase is uncoupled from its stringent physiological regulation by replacement of its 5 ' end and is aberrantly activated by the 5 ' parts of fused genes in thyrocytes that do not normally express ret tyrosine kinase .
 GENE: ret tyrosine kinase; GENE: ret tyrosine kinase
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: ret tyrosine kinase; GENE: ret tyrosine kinase