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Stability tests of VHH72‐biofunctionalized gates. The normalized response of OECTs to SARS‐CoV‐2 spike protein (S1) (1.2 pm, in saliva) when gated with A) HDT SAM‐based electrodes and B) SpyDirect‐based electrodes. The biofunctionalized gates were stored in 10 mm PBS, pH 74 at 4 °C for 3, 7, and 14 days before use.
