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Values of −1/ωX10.1 of the sensor as a function of the total volume of (a) blood or (b) PBS dropped. The dependence of the −1/ωX10.1 of the sensor in which a total volume of 50 μL of PBS was dropped on the drying time is shown in (c). The assumed threshold value (5.5 × 10−7 s/Ω) is indicated as a visual guide.
