Extended Data Fig. 4: Schematic and synthesis of the 1000 bp hairpin DNA.

The construct comprises five functional segments: a hairpin stem, a biotinylated region, a loop, a linker, and a thiol-modified end. The synthesis protocol involves four steps: (1) PCR amplification of the core hairpin sequence; (2) restriction enzyme digestion to generate cohesive ends; (3) annealing to form the hairpin structure; and (4) ligation to assemble the complete construct.