Figure 3.

Representative square-displacement r² histograms obtained from single lipid tracking experiments on dye-labeled (TRITC-DHPE) and LIPO QD-conjugated lipids in a solid-supported phospholipid bilayer. The resulting mean-square displacements of ⟨r²⟩ = 0.19 ± 0.01μm² (dye) and ⟨r²⟩ = 0.20 ± 0.01μm² (QD) are statistically identical and suggest that QD lipids diffuse like their dye-labeled counterparts. The ⟨r²⟩ data are based on a time lag of t_lag = 50ms.