Fig. 4From: A micro-/nano-chip and quantum dots-based 3D cytosensor for quantitative analysis of circulating tumor cellsDifferential pulse voltammetry responses of the supersandwich cytosensor incubated with (a) Jurkat cells at 105 cells mL−1 and (b–f) different concentrations of MCF7 cells: 101, 102, 103, 104, 105 cells mL−1. Insert: Calibration curve of MCF7Back to article page