FIG. 3.
Transmission electron micrographs of the midgut tissue from an Ixodes pacificus tick. (A) Longitudinal view of the midgut tissue: B, bacteria; Li, lipid inclusion. (B, C) Higher magnification of bacteria: thick arrows point to the outer membrane; arrowheads point to the inner membrane. Notice the electron-lucent vacuole-like structures (V) within the bacteria.