2224
Abrogation of p53 function by E6 resulted in an increase in the spontaneous mutation frequencies at the heterozygous thymidine kinase ( TK ) locus but not at the hemizygous hypoxanthine phosphoribosyl transferase ( HPRT ) locus .
 GENE: p53; GENE: E6; GENE: thymidine kinase; GENE: TK; GENE: hypoxanthine phosphoribosyl transferase; GENE: HPRT
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: p53; GENE: E6; GENE: thymidine kinase; GENE: TK; GENE: hypoxanthine phosphoribosyl transferase; GENE: HPRT