Stanford University of Palo Alto, Calif., 8,614,056, "Microfluidic method for measurement or detection involving cells or biomolecules." The patent relates to devices for detecting or determining the concentration of of biomolecules. According to the patent, these devices consist of multiple channels fabricated with surfaces that functionalized with molecules that interact with biomolecules bound to microspheres. The device also includes a system that measures change in electrical impedance or optical microscopy as the microsphere moves through the channels.

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