The ornamental design for an illuminatedportion of an electronic mouse, as shown and described.
FIG. 1 is a rear-left perspective view of an illuminated portion of an electronic mouse showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof; and,
FIG. 5 is a top view thereof.
The broken line showings of portions of the electronic mouse, including the wheel well and body regions, are made for illustrative purposes only, and form no part of the claimed design. The radial lines extending outward from the claimed design portion represent illumination for illustrative purposes only and do not form a part of the claimed design. The broken lines shown in all views are for illustrative purposes only and form no part of the claimed design.