Molluscum contagiosum virus. Coloured transmission electron micrograph (TEM) of two molluscum contagiosum virus (MCV) particles. MCV is a poxvirus that causes molluscum contagiosum in humans, producing many small raised lesions on the skin. This virus consists of a DNA (deoxyribonucleic acid) core in a protein coat, or capsid, surrounded by an envelope. The proteins allow the particles to enter and leave host cells. MCV reproduces by entering cells and hijacking their biochemical machinery, producing many copies of itself. Molluscum contagiosum usually clears up in a few months but may require medical treatment. This sample of MCV was taken from an eye lesion. Magnification: x102,000 when printed 10 centimetres wide.