2773
The only other purine-pyrimidine pairings would be AC and GT and UG ( in RNA ) ; these pairings are mismatches because the patterns of hydrogen donors and acceptors do not correspond .
 location: RNA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: RNA