Light micrograph showing a cross section through a hair follicle. The hair shaft is made up of hard dead protein called keratin, which is observed in the center. This is surrounded by skin cells that ...

Transverse section through the neural tube of an early stage chick embryo. The brown stain shows the neurofilament in the axons of the commisural neurons (running down the sides of the neural tube) an...

This image illustrates the frustule (silica cell wall) of a warm-water marine diatom, Podocystis spathulata. Diatoms are aquatic, single-celled algae which possess a hard shell. The shapes vary but al...

Light micrograph of volvox. Volvox are a relatively large (approximately 500 µm) green algae. They consist of hollow spherical colonies with up to 15,000 cells embedded in their gelatinous walls. E...

Colorized light micrograph of Aggregatibacter actinomycetemcomitans colonies. A. actinomycetemcomitans is a Gram-negative bacteria commonly found to cause infections of the oral cavity and often isola...

Colorized image of a colony of Actinobacillus actinomycetemcomitans, one of the thousands of different types of bacteria found in the mouth. It is one of the main causes of gum disease, which, as well...

Photomicrograph of a semithin section of a termite's gut stained with haematoxylin and eosin. The gut appears to be packed with Trichonympha - a genus of protists found in the gut of many termite spec...

Light micrograph of elastic cartilage of the ear. This type of cartilage is made from a protein called elastin and is formed from a network of elastic fibers and collagen. The fibers form bundles whic...

Light micrograph of elastic cartilage of the ear. This is a type of cartilage (connective tissue) that is present in the outer ear. It contains a network of collagen and elastin fibers, which gives it...

Bacteria imaged inside the intestines of live zebrafish (Danio rerio) larvae, 5-6 days post-fertilization. The bacteria were engineered to constitutively express Green Fluorescent Protein (GFP), or dT...