Confocal image of axons (green) making contact with muscle fibers at neuromuscular junctions. As seen here more than one nerve fiber initially contacts each muscle fiber. As development proceeds, the ...

Colorized scanning electron micrograph of a human egg. The egg is surrounded by a glycoprotein coat called the zona pellucida which aids in trapping and binding the sperm. Two residual coronal cells f...

Scanning electron microscope image of a blood clot showing a white blood cell in the center.

Confocal microscope image of a 3T3 fibroblast cell. The nucleus has been stained blue, and two components of the cytoskeleton, actin microfilaments and intermediate filaments, are stained red and gree...

Fluorescent micrograph showing a section of human appendix infected with the measles virus. The measles virus is shown in green, cytokeratin is shown in red, which marks the epithelium, and Dapi stain...

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...

Fluorescent micrograph of differentiating mouse embryonic stem (ES) cells. Embryonic stem cells are pluripotent, meaning that they have the ability to differentiate into any cell type depending on th...

This scanning electron micrograph shows mycroplasma (colorized pink), a genus of bacteria that lack a cell wall. Without a cell wall they are unaffected by many common antibiotics, such as penicillin,...

This confocal image shows a 13.5 days post coitum female mouse gonad at high magnification (x40). The developing ovary and mesonephros were fluoresently stained with an endothelial and germ cell marke...

High voltage (1MeV) transmission electron microscopy image of a 0.5 micrometer section of a Chinese hamster ovary cell in metaphase containing a longitudinal section of a chromatid pair, and revealing...