TimelineΒΆ
1908 Chicken leukosis caused by virus
1911ish Rous isolates the virus: rsv
1953 Mercaptopurine approved for medical use (anti-cancer) in US
1908 Chicken leukosis caused by virus
1911ish Rous isolates the virus: rsv
1953 Mercaptopurine approved for medical use (anti-cancer) in US