Colorized scanning electron micrograph of a mouse trachea and its red blood cells.

Scanning electron micrograph of a diatom frustule. The frustule is the hard and porous cell wall or external layer of diatoms.

Colorized scanning electron micrograph of a Lilium pollen mounted on a carbon pad.

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

Colorized scanning electron micrograph of a a grain of pollen from a peony plant. Peonies are herbaceous plants native to Asia, Southern Europe and Northern America.

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

Colorized scanning electron micrograph of an open stoma on the surface of a leaf of lettuce (Lactuca sativa). A stoma is a small pore found on the underside of plant leaves and stems that allow for ga...

Scanning electron micrograph of the Drosophila compound eye. Close-up shows the multi-faceted cornea (pink) and the thin, hair-like structures called setae (green) which are believed to reduce glare.

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.