FIGURE 1 | Historical figures.

From the following article:

Why do viruses cause cancer? Highlights of the first century of human tumour virology

Patrick S. Moore & Yuan Chang

Nature Reviews Cancer 10, 878-889 (December 2010)

doi:10.1038/nrc2961

Why do viruses cause cancer? Highlights of the first century of human tumour virology

a | The chicken tumour that started it all. This photograph from 1909 shows a sarcoma on the external chest wall of a chicken that was used by Francis Peyton Rous to discover the Rous sarcoma retrovirus8. b | Vilhelm Ellerman (1871–1924), shown on the left, and his assistant, Oluf Bang (1881–1937), shown on the right. These Danish scientists first succeeded in transmitting a leukaemia-inducing avian retrovirus in 1908. These experiments formed a basis for Rous's subsequent experiments showing a viral cause of a solid cancer. Images courtesy of Medical Museion, Copenhagen University, Denmark.

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