DR GOPAL MURTI / SCIENCE PHOTO LIBRARY DR GOPAL MURTI / SCIENCE PHOTO LIBRARY
Xenotropic murine leukaemia virus particles (purple), coloured transmission electron micrograph (TEM). Each virion (virus particle) consists of a core of RNA (ribonucleic acid) surrounded by a protein nucleocapsid and lipid envelope. This mouse retrovirus is also able to infect cells of other species, including humans. Magnification: x65,000 when printed at 10 centimetres tall.
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