| http://www.w3.org/ns/prov#value | - In yet another embodiment, the invention features a nucleic acid sensor molecule having specificity for a class of compounds comprising a drug, class of drugs, or metabolites thereof. [0018] In one embodiment, the invention features a nucleic acid aptamer molecule that is used to assay for the presence of a drug or drug metabolite in a system or sample, such as a biological system or sample.
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