Abstract
Total internal reflection fluorescence (TIRF) is used in concert with the multifrequency phase and modulation (MPM) technique to study in situ the interfacial distribution of surface-immobilized F(ab′) antifluorescein antibodies. Using this new technique we recover information on the surface-immobilized receptor dynamics and demonstrate that this particular immunosurface is composed of an unstable distribution of biodomains. The MPM-TIRF technique adds a new tool to our arsenal for studying the dynamics of biosensor interfaces.
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