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. Author manuscript; available in PMC: 2015 Apr 27.
Published in final edited form as: Nano Lett. 2007 Sep 22;7(10):3071–3079. doi: 10.1021/nl071547f

Figure 1.

Figure 1

Human mesenchymal stem cells (hMSCs) labeled with bioconjugated quantum dots (QDs) undergo proliferation up to the tested 22 days. hMSCs after overnight incubation with bioconjugated QDs (30 nM) (a–a2) Following the removal of extracellular QDs, QD-labeled hMSCs and unlabeled hMSCs of the same subpopulation were continuously cultured for 4, 7, and 22 days (b–b2, c–c2, d–d2, respectively). Scale bar: 30 μm. QDs were internalized in the cytoplasm, even after 22 days of culture-expansion (e–e2), clearly observed in fluorescent (e1) and overlay (e2) images, apparently endocytosed as aggregates. Scale bar: 5 μm.