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Methods for the detection of protein - DNA conjugates , as well as approaches for nucleotide exchange and distinguishing between GDP - and GTP - bound Ypts on microarrays , are reported .
 Chemical: nucleotide; Chemical: GDP; Chemical: GTP
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: nucleotide; Chemical: GDP; Chemical: GTP