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A binder that is specific for a target will be applicable to detection of a variety of molecules such as bioactive substances, environmental contaminants and so on. Nucleic acid aptamers obtained by in vitro selection method are interesting and promising binders. To enhance the ability of nucleic acid aptamers, we prepared a combinatorial modified DNA library containing arginyl uracil base by using arginyl dUTP, then attempted screening of glutamic acid-binding aptamers from the library by in vitro selection method.

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