Fig. 9From: Effects of the surface charge of polyamidoamine dendrimers on cellular exocytosis and the exocytosis mechanism in multidrug-resistant breast cancer cellsThe fluorescence intensity of PAMAM dendrimers in MCF-7/ADR cells (a) and the nuclei in MCF-7/ADR cells (b). ** indicates P < 0.01 vs. the PAMAM-NH2-FITC group; mean ± SD, n = 3Back to article page