8824
Anti - PTB antibodies did not inhibit the binding of PTB to RNA because they were able to supershift RNA - PTB complexes .
 Anti - PTB antibodies, PTB, RNA - PTB complexes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Anti - PTB antibodies, PTB, RNA - PTB complexes