19552
Purine - sensing ribozymes are designed by fusing the minimal version of the hammerhead ribozyme with bacterial guanine or adenine aptamers by modeling 3D interactions .
 Chemical: Purine; Chemical: guanine; Chemical: adenine
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: Purine, guanine, adenine 
Answer:
 Chemical: Purine; Chemical: guanine; Chemical: adenine