Human immune response

Human immune response. Computer artwork showing the interactions of the various white blood cells (purple) involved during an immune response in the human body. Red blood cells (red, round) can also be seen in a blood vessel (bottom), in which the white blood cells migrate to the site where they are needed.

Human papilloma virus

Human papilloma virus (HPV). The protein coats, or capsids enclose their genetic material. The capsids are studded with surface proteins. 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.