Figure 4: Staple DNA types. (a) general and special type staples, left: Z staple (violet) and S staple (green); right: L staple (blue) and R staple (red); (b and c), variations on the staples when located on the top and bottom edges: (b) S (violet) and Z (green) type staple variations when meeting the top of a seam (left) and the bottom of a seam (right); (c) L (red) and R (blue) type staple variations on the top edge (top) and the bottom edge (bottom).