59.8 MB (4.6 MB compressed)
5052 x 4136 pixels
42.7 x 35.1 cm ⏐ 16.8 x 13.8 in (300dpi)
EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Vaccinia virus particles (VV) being made inside a host cell, coloured transmission electron micrograph (TEM). VV is composed of a DNA (deoxyribonucleic acid) core, surrounded by a protein coat and a lipid envelope. Vaccinia causes cowpox, a disease of cattle and humans, which produces skin lesions. This variant is a vaccine strain, used to vaccinate against smallpox, a related but more deadly human disease. VV DNA is also used in gene therapy and genetic engineering as a carrier for genes. Magnification: x25000 when printed 10 centimetres wide.
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