Cilium is enveloped by an adjacent cell. (A) Serial EM sections of a pocket cilium that exits the cell in the bottom half of the image and is enveloped by the adjacent cell. Scale bar is 200 nm and z interval is 30 nm. (B) Single z slice from the sections in A colored to highlight the cilium (cyan), the cell of cilium origin (blue), and the enveloping cell (lavender). (C) 3D reconstruction of the same cilium. The basal body is purple, and the membrane inclusion adjacent to the cilium is green.