Representative time-lapse movie of a human mammary tumor fragment in Matrigel. CIL 42161 is a related movie that shows a human mammary tumor fragment in collagen. Images collected every 20 minutes a...

Representative time-lapse movie of a human mammary tumor fragment in collagen. CIL 42160 is a movie of a normal mammary fragment in Matrigel. Images collected every 20 minutes and bar is 50 microns....

Representative time-lapse movie of a normal mouse mammary fragment in Matrigel. Images taken every 20 minutes. CIL 42151 is a related movie of a normal mammary fragment in collagen I. This movie is...

Colorized scanning electron micrograph showing two lung cancer cells. These cells were grown using cell culture techniques.

Colorized scanning electron micrograph of a lung cancer cell grown in culture.

A Nomarski differential interference micrograph of a filament of Nostoc sp, a nitrogen-fixing cyanobacterium.

A colorized scanning electron micrograph of pancreatic cancer cells grown in culture. See additional image at CIL: 39104.

Scanning electron micrograph of coralline algae. Coralline algae are characterized by a thallus that is hard because of calcareous deposits contained within the cell walls.

Chicken basilar papilla (cochlea) hair bundles imaged with field-emission scanning electron microscope.

Scanning electron microscope image of Penta lanceolata anther (pollen bearing part of stamen).