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51.4 MB (51.0 MB compressed)
3750 x 4787 pixels
31.8 x 40.6 cm ⏐ 12.5 x 16.0 in (300dpi)
DR GOPAL MURTI / SCIENCE PHOTO LIBRARY DR GOPAL MURTI / SCIENCE PHOTO LIBRARY
Vaccinia virus particles (VV), coloured transmission electron micrograph (TEM). VV is composed of a DNA (deoxyribonucleic acid) core, surrounded by a protein coat (bright green) and a lipid envelope (dark green). 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: x67,000 when printed 10 centimetres tall.
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