Gallbladder wall of a human patient with gallstones. The duct (clear zone at center) is lined by highly polarized epithelial cells with dark nuclei at the base. At the top of the picture, below the...

Tentacle of Portuguese Man o' War, Physalia physalis imaged with a stereomicroscope at 30x. Notorious for its painful, powerful sting, the Portuguese Man o' War has a gas filled floating chamber that ...

Human duodenal epithelium, at the level of the crypt. Fixation was carried out inbuffered formal-calcium. Peroxisomes are stained with DAB by their catalase activity at pH 10.5, postosmicated and embe...

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...

A human (Homo sapien) cheek cell smeared on a coverslip and imaged by birghtfield, phase contrast and differential interference contrast (DIC) microscopy. Images were acquired on a Zeiss Axiovert 200M...

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 ...

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...

Histology slide highlighting simple columnar epithelium, which line the luminal surfaces of the jejunum, the middle section of the small intestine. This image is slide 29 in the University of Michig...

Brightfield image using an depth of fieldd showing the skeleton of a radiolarian, a single-cell protozoan with an intricate mineral skeleton. Radiolarian skeletons typically have a central capsule di...