10046
Mag1 excises N3 - and N7 - alkylguanines and 1 , N ( 6 ) - ethenoadenine from DNA , whereas Mag2 has been reported to have no detectible alkylpurine base excision activity despite high sequence and active site similarity to Mag1 .
 Chemical: N3 - and N7 - alkylguanines; Chemical: 1 , N ( 6 ) - ethenoadenine; Chemical: alkylpurine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: N3 - and N7 - alkylguanines; Chemical: 1 , N ( 6 ) - ethenoadenine; Chemical: alkylpurine