Fig. 5From: Near-infrared quantum dots labelled with a tumor selective tetrabranched peptide for in vivo imagingTransmission electron micrographs of HT-29 cell line incubated with NT4-QDs (a, b) or with unlabelled QDs (c). NT4-QD clusters: a localized at cell membrane after 30 min of incubation (binding), b entrapped in vesicles inside cells after 4 h of incubation. Scale bar 200 nmBack to article page