Fig. 1From: Real-time in vivo imaging of subpopulations of circulating tumor cells using antibody conjugated quantum dotsIntegrated fluorescence signals from a section of a blood vessel with a diameter of 50 µm as a function of observation time. The spikes in integrated fluorescence intensity indicate that individual circulating tumor cells (CTCs) are passing through the detection region. Bottom control signals are the integrated fluorescence signals from a section in the same blood vessel without detectable CTCsBack to article page