ROBERT BROCKSMITH / SCIENCE PHOTO LIBRARY ROBERT BROCKSMITH / SCIENCE PHOTO LIBRARY
Virus. Computer artwork of virus particles. Viruses consist of a small core of genetic material, either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) surrounded by a protein coat, or capsid. The capsid may itself be surrounded by a glycoprotein envelope. Viruses are primitive organisms that lack the ability to reproduce independently of a host cell.
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