Freeze-fracture preparation of the plasma membrane from an unspecialized area composed of Sertoli cells of the guinea pig testis. With the freeze-fracture technique, tissue is rapidly frozen and crac...

The plasma membrane of Paramecium multimicronucleatum seen in a freeze fracture replica. The two rows of IMPs can be seen on the P-face of the plasma membrane that connects the plasma membrane to the ...

The plasma membrane of Paramecium multimicronucleatum seen in a freeze fracture replica. The two rows of IMPs can be seen on the P-face of the plasma membrane that connects the plasma membrane to the ...

A high resolution view of the left side of the buccal cavity. It is covered by the plasma membrane, alveoli and a single partial layer of microtubules. Specialized cytoplasm lines the posterior end of...

Planar view of the cortex demonstrating that the striated bands do indeed link the internal slopes of one cortical unit with all surrounding units. Parasomal sacs lie to the side of a single basal bod...

Striated band spanning the base of a longitudinal ridge (kinetodesmal fibers are seen in the ridge in cross section). The epiplasm appears absent from the top of the ridge or is replaced by two thicke...

In addition to plates the plasma membrane contains IMPs on its P-fracture face in ring or parenthesis shape at sites of trichocyst secretion. A ring actually consists of two circles of IMPs and signif...

Septa of bordering alveoli when lying in the plane of section exhibit pores at their outer margins closest to the plasma membrane. This shows that there is physical continuity between the lumens of al...

A view of cortical fibers except the observer is looking at a cross-sectioned cell as though from anterior toward the posterior end of the cell; in this view the kd sections are seen on the left side ...

Longitudinal section of a striated band lying superficially to an arm of the infraciliary lattice but not contacting it. A post is seen at the junction of a branch in the infraciliary lattice. TEM tak...