A view of the E-face of the fractured collecting canal of the contractile vacuole showing its association with microtubular ribbons and with the smooth spongiome. The E-fracture face of the smooth spo...

Higher resolution of the area that shows the clathrin-coated cage near the peniculus and clathrin coated preendosomal and partially coated preendosomal vesicles. Early endosomes like the preendosomal ...

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 ...

What is the filamentous reticulum? When exposed in planar view lying under the ribbed wall, the filamentous reticulum is seen to be composed of a sheet of mutiple interdigitating rows of nodes separat...

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...

Cells taken from stationary phase cultures often have larger lysosomes which contain additional paracrystalline layers. These lysosomes may be on their way to becoming the crystals which appear in lar...

Immunogold label specific for L1 antigen on DV-II. Monoclonal antibody to antigen L1 specifically labels DV-II and acidosomes but not lysosomes. Lysosomes are osmotically active so they tend to shrink...

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...