Quick-freeze deep-etch of an ampulla. The P-fracture face has numerous IMPs. The microtubular ribbon now forms two bands next to this ampulla. The ribbons will split into additional bands as they pass...

A more extensive freeze-fracture view of the membranelles on the left side of the buccal cavity. Fractures of eighty or more basal bodies can be counted in each of the dorsal three rows of the dorsal ...

Secondary lysosomes contain a lumen in quick-freeze deep-etch (QF-DE) images resembling etched matrix proteins rather than the honeycomb appearance of acidosomes. Lysosomes often have one or more para...

In this image a portion of the true surface of the plasma membrane is exposed where the culture medium has been etched away. The IMPs of the plates can also be viewed less distinctly on the true surfa...

The P-face of the ciliary membrane at the base of the cilium has 9 triple rows of IMPs in register with the 9 doublets of the internal axoneme. It is thought that these IMPs may be sites of calcium in...

Quick-freeze deep-etch of granulo-fibrillar material at the crests of the ridges. This material is composed of thinner and shorter filaments that, like the striated bands, appear to bind to the membra...

Isolated mitochondria that have been quick-frozen, fractured and deep-etched show some space between the inner and outer membranes. Arcs of tubules, where they are tangentially fractured, show the hel...

Freeze fracture of the plasma membrane and outer alveolar membrane of the pellicle of V. microstoma. The surface of Vorticella is encircled by rings which follow the septa of underlying alveoli. In th...

Leishmania mexicana amastigote forms (WHO strain MNYC/BZ/62/M379). Amastigotes were grown in axenic culture. The cells were fixed with glutaraldehyde, dehydrated in ethanol, critical-point dried and s...

A scanning electron microscope image of an activated mast cell illustrating the convoluted topography of the cell membrane, which is populated with receptors.