Fig. 5From: Multi-carbon dots and aptamer based signal amplification ratiometric fluorescence probe for protein tyrosine kinase 7 detectiona Fluorescence spectra of the sensor response to PTK 7 with or without DNase I. b Fluorescence spectra of the probe in the presence of various concentrations of PTK 7 (in range of 0.1 − 200 ng mL−1). c The calibration curve of PTK 7 detection in range of 0.1 − 200 ng mL−1Back to article page