Staphylococcus sp. Coloured scanning electron micrograph (SEM) of a colony of Staphylococcus sp. bacteria on the epithelial cells of the trachea. The trachea (windpipe) is lined with cilia (hair- like projections) which help keep it free of dust and other irritants. These Gram-positive bacteria often appear in groups that resemble clusters of grapes (as here)
Colored scanning electron micrograph (SEM) of squamous cell carcinoma (cancer) cells from a human mouth. The many blebs (lumps) and microvilli (small projections) on the cells' surfaces are typical of cancer cells.
Looking uncannily like a collection of sushi, in fact this is a closeup of Smallpox viruses. The virus consists of genetic material (red), DNA (deoxyribonucleic acid), enclosed by a protein capsid (coat, yellow)
Migrating cancer cell. Coloured scanning electron micrograph (SEM) of a cultured cancer cell moving (metastasising) through a hole in a support film. Numerous pseudopodia (arm-like), fillipodia (thread-like) and surface blebs (lumps) can be seen. These features are characteristic of highly mobile cells, and enable cancerous cells to spread rapidly around the body, and invade other organs and tissues (metastasis).