Figure 6From: Reduced cytotoxicity of insulin-immobilized CdS quantum dots using PEG as a spacer Optical microscopic images of human fibroblasts cultured for 6 and 24 h. In a (a) polystyrene culture dish and in the presence of (b) CSNPs, (c) PCSNPs, and (d) ICSNPs. Original magnification is ×200.Back to article page