MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Herpes simplex type 1 virus (HSV-1) particle, computer illustration. HSV particles (virions) are composed of an outer lipid envelope (dark green) and an icosahedral protein core (capsid, bright green) encasing DNA (deoxyribonucleic acid, red), the genetic material of the virus. HSV-1, more commonly known as oral herpes, causes sores around the mouth and lips known as cold sores.
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