Migrating cancer cell. Coloured scanning electron micrograph (SEM) of a cancer cell migrating down a pore in the filter on which it has been cultured. The movement of cancer cells around the body (metastasis) is an important part of a cancer's malignancy. Research into this movement intends to find ways to prevent cells from moving around the body. Magnification: x2500 when printed 10 centimetres wide.