7963
In contrast , a TGF beta receptor 1 ( TGF beta R1 ) inhibitor abrogated Smad7 , but not pSmad2 foci at DSBs sites .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None