DR LINDA STANNARD, UCT / SCIENCE PHOTO LIBRARY DR LINDA STANNARD, UCT / SCIENCE PHOTO LIBRARY
Papilloma viruses. Computer artwork (left) and coloured transmission electron micrograph (TEM, right) of human papilloma viruses (HPV). Their protein coats, or capsids (red, seen best in the artwork), enclose their genetic material. The capsids are studded with surface proteins (blue). HPV causes warts, which commonly grow on the hands, the soles of the feet, the body's mucous membranes and the genitals. It has also been linked with some skin and cervical cancers. The papilloma virus belongs to the papovavirus group, most of whose members are capable of inducing non- malignant tumours. Magnification unknown.
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