Cancer cell. Coloured scanning electron micrograph (SEM) of a spreading cancer cell, showing its uneven surface and cytoplasmic projections. Clumps of cancerous cells form tumours, which possess the ability to invade & destroy surrounding tissues & travel to distant parts of the body to seed secondary tumours. Malignant cells proliferate and grow in a chaotic manner, with defective cell division retained within each new generation of cells. Variations also occur in the size & structure of the cells. The cell here is taken from a breast cancer. Magnification: unknown.