1687
All donor and acceptor sites adhere to the canonical GT - AG rule , except for the donor site of intron 21 , where a variant form GC is used instead of GT .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities:  
Answer:
 None