After the addition of fluconazole, there were bands that were higher in molecular weight than the starting library, N40 (lane N), and the original sequences.

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After the addition of fluconazole, there were bands that were higher in molecular weight than the starting library, N40 (lane N), and the original sequences. After the addition of fluconazole, there were bands that were higher in molecular weight than the starting library, N40 (lane N), and the original sequences. A denaturing polyacrylamide gel (panel C) highlights the fact that these bands were, in fact, aptamers with unique molecular weights and not aggregates of the smaller original library sequence N40. The relative binding capabilities of the heavy and light bands were different from those of the control (counter-SELEX) and target (posaconazole) labeled beads, respectively. Light bands from rounds 12 and 13 showed little preference for either type of beads. The heavy bands, however, bound significantly better to the target labeled beads than the control beads. Negative values occurred when emission at 525 nm was below that at 505 nm. Lanes C, B, and A in panel D correspond to the separated bands C, B, and A in panel C. Gregory R. Wiedman et al. mSphere 2017; doi:10.1128/mSphere.00274-17