Figure 3. Characteristics and stability of the LP-Td. a) TEM images of LP-Td. The scale bar is 200 nm. b) The hydrodynamic size of LP-Td determined by DLS analysis. c) Enzymatic stability of Td and LP-Td. 0.2 μM cy3/cy5 doubly labeled Td or LP-Td were incubated with DNase in different concentrations for 15 min. “ns”: no significance; “**”: p <0.01.