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Write about noble lecture on virus. Use the following articles:

THE DNA PROVIRUS HYPOTHESIS
The Establishment and Implications of RNA-directed DNA Synthesis
Nobel Lecture, December 12, 1975
by
HOWARD M. TEMIN
University of Wisconsin, Madison, Wisconsin, ‘U.S.A

VIRUSES, POLYMERASES AND CANCER
Nobel Lecture, December 12, 1975
by
DAVID BALTIMORE
Massachusetts Institute of Technology, Cambridge, Mass., U.S.A

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Throughout the last century, a biologist and more specifically a microbiologist has been fascinated by what is called as “virus,” and the interest and curiosity of the subject are reflected in the vast number of noble prizes distributed to researchers working on them. It was not until the second decade of the 20th century when Peyton Rous in 1911 discovered the infecting capacity of chicken sarcoma filtrate devoid of cells that human being encounters these mysterious entities, which are neither living nor dead. Human being since ages have been inquisitive and the discovery of Rous sarcoma opened the gates for the tumultuous journey of “virology” leading to some fundamental discoveries of molecular biology. In this journey two great scientists, David Baltimore and Howard M Temin received a noble prize for the discovery of RNA dependent DNA polymerase, thus challenging the central dogma of molecular biology. The scientists worked on a variety of viruses, including retroviruses. However, both achieved their goal through tumultuous independent paths, and both believed in two different theories. Baltimore believed in a modified virogene-oncogene hypothesis, while Temin vehemently put forward his proto-virus hypothesis.
Retroviruses are a class of RNA viruses that contain RNA dependent DNA polymerase, popularly called as Reverse Transcriptase in their virion particles. When they infect a host cell, this enzyme along with their nucleic acid genome enters the cell. The nucleic acid at its 5’ end has an RNA primer already attached to it, which is extended by reverse transcriptase to produce a nascent DNA which is then integrated into the host genome (proto-virus)....
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