Light micrograph of onion (Allium cepa) root tip cells stained with acetocarmine to show nuclei and chromosomes. The field includes cells in interphase, prophase, metaphase, and late telophase.

Peroxisomes in human parenchymal liver cell, contrasted for catalase activity. Reaction product typically differs between individual organelles. Several mitochondria are seen, as well as many dark gl...

This cross section shows a human fetal testis. Numerous seminiferous tubules appear within a lobe of the testis. It has not been treated with an antibody but is autofluorescent and therefore appears b...

A colorized SEM image of a human proximal tubule, showing the tubular structure and projections extending over the tissue surface.

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

Arabidopsis thaliana (thale cress) embryos imaged with confocal microscopy. Honorable Mention, 2009 Olympus BioScapes Digital Imaging Competition®.

Immunolabeling of endogenous splicing factor SC35 (red) and transfected FP-tagged lamin B receptor. Image stack was acquired using a Deltavision deconvolution microscope.

Scanning electron micrograph showing the tip of a Hydra viridis tentacle. A meshwork of triggered nematocyst cells is visible. When hooked cnidocytes on the surface of the tentacle come in contact wit...

Scanning electron micrograph showing tentacles on the head of a Hydra viridis. Epithelial cells located at the base of the tentacle are in a flat, contracted state. Cell distal to the head of the H. v...

Dominant features of a nephron in the cortex of rat kidney showing f-actin localization in the glomerulus, a blood vessel, and proximal tubules. The glomerulus is the large ball at the left. The blo...