Dictyostelium discoideum (ameoba) phagocytosing budded yeast (S. cerevisiae). The amoeba is expressing mRFP-LimEdelta (labels actin filaments, red) and PHcrac-GFP (labels membranes containing phospha...

Developing fruit fly nerve cord. The glial cells (black dots) and nerve cells (brown bands) in this developing fruit fly nerve cord formed normally despite the absence of the SPITZ protein, which bloc...

Lily mitosis. A light microscope image of a cell from the endosperm of an African globe lily Haemanthus (Scadoxus) katherinae. This is one frame of a sequence that shows all phases of mitosis. The lil...

Gallbladder wall of a human patient with gallstones. The top layer is composed of highly polarized epithelial cells with microvilli partially visible at the apex and dark nuclei at the base. Below ...

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...

A photomicrograph of a stained semi-thin section of mouse ovary, showing a maturing Graafian follicle. The ovary contains many follicles that contain immature oocytes (egg cells). The follicle is impo...

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...