4241
The binding of PTB was antagonistic to the binding of U2AF to the enhancer - located pyrimidine tract .
 GENE: PTB; GENE: U2AF
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: PTB; GENE: U2AF