Figure 1. Characteristics of the Td. a) A sketch of Td self-assembly. b) Agarose gel of single-strand DNA, partial assembly, and Td. Lane 1: S1; Lane 2: S1+S2; Lane 3: S1+S2+S3; Lane 4: S1+S2+S3+S4. c) AFM images of Td showing its triangle-like shape. The scale bar is 10 nm. d) The hydrodynamic size of Td determined by DLS analysis.