11032
When cells were microinjected with TFOs designed to bind to a 30 - bp polypurine site situated between the two TK genes , recombination was observed at frequencies in the range of 1 % , 2 , 500 - fold above the background .
 GENE: TK genes
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: TK genes 
Answer:
 GENE: TK genes