3462
RET / PTC oncogenes , generated by chromosomal rearrangements in papillary thyroid carcinomas , are constitutively activated versions of proto - RET , a gene coding for a receptor - type tyrosine kinase ( TK ) whose ligand is still unknown .
 GENE: RET; GENE: PTC; GENE: proto - RET; GENE: receptor - type tyrosine kinase; GENE: TK
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; GENE: PTC; GENE: proto - RET; GENE: receptor - type tyrosine kinase; GENE: TK