Word: tritium
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Dates: during 1970-1970
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...three researchers confirmed the fact that viral RNA material was indeed producing its own DNA. They labelled four chemical building blocks of DNA with a radioactive isotope of hydrogen called tritium. After mixing the building blocks with viral RNA, the "tracer" element appeared in what was chemically identified as DNA. Thus it was apparent that the RNA had assembled the blocks to form DNA in its own image...