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Responses (In) obtained from the sensor against patient 1 COVID-19 negative sample (NS), patient 1 NS spiked with 64 fM S1 (NS+S1) and Patient 4 COVID-19 positive sample (PS). All measurements were performed using the ncovS1-MIP-modified chip connected to a portable potentiostat (EmStat3 Blue, PalmSens BV, The Netherlands).
