Fig. 1From: Nanoscale Relationship Between CD4 and CD25 of T Cells Visualized with NSOM/QD-Based Dual-Color Imaging SystemSchematic of the NSOM/QD-based dual-color imaging system, in which the charge-coupled device (CCD) was used as the monitor of optical fiber probe adjustment, and two avalanche photodiodes (APD) and two filters (605 ± 10 or 655 ± 10 nm) were employed as the detectors of two color fluorescence images, respectivelyBack to article page