Figure 3.

Fluorescence activation of the strand-displacement probes by DNA. (a) Fluorescence spectra of the iNOS probe (0.2 μM FAM-iNOS-PNA annealed to 0.4 μM iNOS-DNA-DABCYL) following addition of 0.1, 0.2, 0.4, and 2 μM iNOS DNA. Positive control: 0.2 μM FAM-iNOS-PNA annealed to 0.4 μM iNOS-DNA. (b) Fluorescence spectrum of the pLuc probe (0.2 μM FAM-pLuc-PNA annealed to 0.4 μM pLuc-DNA-DABCYL) following addition of 0.4 μM iNOS-DNA. Positive control: 0.2 μM pLuc-FAM-PNA annealed to 0.4 μM pLuc-DNA. Excitation wavelength: 488 nm, temperature: 37°C.