Fig. S2.

Conical structure of setae and their nanogrooves. (A and B) The diameters of setae (D) in different positions away from the tip (L₁) present conical structures with conicity ($D/2L$) of 0.035. (C and D) The diameters of V-shaped nanogrooves (D) in different positions away from the tip of V-shape (L₂) present similar conical structures with conicity ($D/2L$) of 0.249.