ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Herpes viruses. Coloured transmission electron micrograph (TEM) of four herpesviruses. These viruses measure only about 200 nanometres across. The viral DNA is inside an icosahedral protein coat (red), which is itself enclosed by a membrane or envelope (yellow) studded with viral glycoproteins that help the virus attach to target host cells. The herpesvirus group includes several types of virus that cause disease in humans, such as chickenpox, cold sores and genital herpes. Magnification x35,000 at 35mm size.
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