Li et al. Nanoscale Res Lett 2011, 6:29 http://www.nanoscalereslett.com/content/6/1/29 Page 5 of 8 Figure 4 Confocal fluorescence microscopy images of different leukemia cancer cells treated with anticancer agents. a K562 treated with DNR, c K562 treated with DNR and PLA nanopolymers, e K562 treated with DNR conjugated with PLA/Au nanocomposites (DNR was 1 × 10-6 M in the above systems); b K562/AO2 treated with DNR, d K562/AO2 treated with DNR and PLA nanopolymers, f K562/AO2 treated with DNR conjugated with PLA/Au nanocomposites (DNR was 1 × 10-6 M in the above systems). g and h, respectively, give the quantitative fluorescence intensity curves of images for K562 system (g) and K562/AO2 system (h) in which the single cell was respectively selected from the above related systems.