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. 2022 Mar 23;1205:339718. doi: 10.1016/j.aca.2022.339718

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Fig. 1 — Immunosensor response with increasing concentrations of spike protein amplified with streptavidin-HRP. A) Electrochemical and B) spectrophotometric response with 0, 0.1, 0.6, 1, 1.5 and 2 μg/mL spike protein, C) Correlation between electrochemical and optical reading.