Phase contrast image of serum arrested mouse L-1210 cells engaged in spontaneous apoptosis (programmed cell death) after nutrient depletion and acid hydrolysis. The image was taken at 40X, scanned, an...

Fluorescent micrograph of rat embryo fibroblast cell growing in serum stained to reveal actin stress fibres (red) and vinculin (component of focal adhesions) in green/yellow.

Colorized scanning electron micrograph of a human embryonic stem cell (gold) growing on a layer of supporting cells (fibroblasts). Stem cells are derived from very early embryos and can either be grow...