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(A) ATR-FTIR spectra (baseline corrected and min/max normalized) of detections with SNA biosensors; (B) loading plot using the whole spectrum (4000–400 cm−1) of detection with SNA biosensors; (C) score plot using peaks within the range of 1500–1350 cm−1; and (D) score plot with 95% ellipse confidence using peaks within the range of 1500–1350 cm−1.
