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We show here that a minimal mutational strategy of substituting a guanine analogue , 6MI , for single guanine residues within UV1C extends the DNAzyme ' s activity into the violet region of the spectrum .
 Chemical: guanine; Chemical: guanine
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: guanine; Chemical: guanine