The division furrow of a dividing Didinium. A thick layer of epiplasm coated on the cytosolic side by mitochondria forms the constricting ring in the furrow. As usual mucocysts lie between the epiplas...

The macronucleus is the largest organelle in the P. multimicronucleatum cell and can measure 35µm long by 12µm wide. A small fraction of a macronucleus is seen in this micrograph. The chromatin appe...

Like other ciliates P. multimicronucleatum has two morphologically and functionally different nuclei. Shown here is the tiny micronucleus, of which there are four, during interphase of this cell. This...

Low magnification of the epidermal region of the Fundulus heteroclitus scale. The epidermis is separated from the collagen layers of the dermis by the basement membrane. The cells of the epidermis (to...

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...

The appearance of the macronucleus depends on the stage of the cell, whether the cell is in early, middle or late growth phase or is in stationary phase or whether the cell is dividing by mitosis or i...

This time-lapse series illustrates the early division up to the four-cell stage of a C. elegans embryo depleted of npl-4 by RNAi expressing H2B::GFP by DIC and fluorescence microscopy. GFP-tagged hist...

This movie illustrates the early division up to the four-cell stage of a C. elegans embryo depleted of npl-4 by RNAi expressing H2B::GFP by DIC and fluorescence microscopy. GFP-tagged histone H2B allo...