We claim the ornamental design for a DNA capsule, as shown and described.
FIG. 1 is an elevated perspective view of a DNA capsule showing our new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a left elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing in the drawings of a DNA capsule is included for the purpose of illustrating environmental structure and forms no part of the claimed design.