Rough endoplasmic reticulum and Golgi in epidermal cells of Fundulus heteroclitus scales. Epidermal cells undergoing advanced stages of scale development have prominent rough endoplasmic reticulum and...

Drosophila melanogaster thoracic indirect flight muscle from a four week-old wild-type animal. A longitudinal section of myocyte is displayed. Sections of parallel myofibrils are visible between dense...

Scanning electron micrograph of a migratory mouse bone-marrow-derived fibroblast. This cell was found amidst a colony of NPC (Niemann-Pick Disease type C) mutant mouse mesenchymal stem cells isolated ...

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...

Transmission electron micrograph of mouse cardiac muscle in the ventricle. A white blood cell is visible inside a blood vessel.

Transmission electron micrograph of mouse atrial cardiac muscle showing a close up image of the intercalated discs, which support synchronized contraction of the cardiac muscle.

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...

Transmission electron micrograph of mouse cardiac muscle. Transport is visible in the ventricle across a space from one muscle cell to the adjacent muscle cell.

Transmission electron micrograph of ventricle tissue of a mouse cardiac muscle. This image shows the intercalated discs between the muscle fibers as well as many mitochondria and lipid droplets.