A collecting canal of the contractile vacuole surrounded by smooth spongiome remnants and decorated tubules of the CVC. Microtubules bordering the flattened collecting canal are labeled with immunogol...

The nuclear envelope of both the macronucleus, seen here, and the micronucleus consists of 2 membranes containing numerous perforations called pores. Proteins are imported through these pores and ribo...

Electric shock causes massive trichocyst discharge and results in a large accumulation of HRP-labeled vesicles at the ectoplasmic/endoplasmic interface (at the level of the internal ends of the undisc...

A micrograph showing the polyploidal macronucleus of Tetrahymena containing many copies of the genome. Chromatin material is found as condensed electron opaque spots as well as in an uncondensed form...

A cross section of the cell (ventral side up) through the buccal cavity showing basal bodies of the 3 membranelles (1, 2 and 3) lying along the indented dorsal wall. A short segment of the oral ribs s...

A view of the rough endoplasmic reticulum of Tetrahymena that sometimes forms large stacks or concentric circles from which other organelles are excluded. Peroxisomes lie nearby. EM taken on 6/21/67 b...

A view of early endosomes with coated evaginations at their margins. TEM taken on 8/15/67 by R. Allen with Philips 200 operating at 60kV. Neg. 19,200X. Bar = 0.5µm. The negative was printed to paper ...

A post ciliary microtubular ribbon extends from the proximal left side of the basal body and arches toward the cell surface where it ends near the longitudinal microtubular ribbon at the crest of the ...

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...

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...