Phase contrast image of a PTK-1 cell expressing constitutively active Rac1(Q61L). Live cells were visualized using X-rhodamine tubulin (injected at 1 mg/mL)and eGFP-Rac1(Q61L) (injected into the nucl...

Transmission electron micrograph of surface of nuclear envelope of guinea pig spermatocyte prepared by the Freeze-fracture technique shows the unusual clustering of nuclear pores in these cells. From...

Nuclear pores are clearly seen in these transmission electron micrographs of cells after cryo-fixation, freeze-fracture and surface replication. Upper panel shows the outer surface of of the nuclear e...

Traffic Jam: The Dynamic Behavior of a Golgi Matrix Protein This video shows an NRK cell stably expressing the Golgi matrix protein GRASP55-GFP. The Golgi apparatus in mammalian cells is made up of ...

Living Lilium pollen tube labeled with mitotracker green to mark mitochondria (green) and cytochalasin D TRITC to mark endoplasmic reticulum (red) imaged using laser scanning focal microscopy. Shown i...

Scanning electron micrograph of the epidermal surface of the Pacific coho salmon. Ridge-like folds of the plasmalemma, called microplicae, display a labyrinth pattern across the surface, and a circum...

Movie of meiosis I in primary spermatocytes of the crane-fly Nephrotoma suturalis that have been experimentally flattened. Time-lapse polarization microscopy using a Nikon Microphot SA, equipped for...

Movie showing the dynamics of kinetchore microtubules during meiosis I in primary spermatocytes of the crane-fly Nephrotoma suturalis that were experimentally flattened. Time-lapse polarization micros...

Time series of meiosis I, starting at metaphase, in primary spermatocytes of the crane-fly Nephrotoma suturalis that have been experimentally flattened. Time-lapse polarization microscopy using a Nik...

Transmission electron micrographs showing details of nuclear pores in thin sections of an erythroblast (above) and endothelial cell (below). Pores appear to be filled with dark staining material in th...