Panasonic of Osaka, Japan, has received US Patent No. 8,231,768, "Biosensor, biosensor chip and biosensor device." The described biosensor includes a working electrode, a counter electrode, and terminals attached to the respective electrodes by wires. According to the inventors, by employing a structure with at least three electrodes, it is possible to assay a target substance without being influenced by the line resistance on the working electrode side.

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