1944 - Oswald Avery, Colin Macleod, and Maclyn McCarty show that the substance that Griffith discovered is DNA.
1950 - Erwin Chargaff analyzes the bass composition of DNA in cells. He discovers that the amount of adenine and find thymine are almost always equal, as are the amounts of guanine and cytosine.
1952 - Alfred Hershey and Martha Chase confirm that the genetic material of viruses is DNA, not protein. Rosalina Franklin records a critical x-ray diffraction pattern, demonstrating that DNA is in the form of a helix.
1953 - James Watson and Francis Crick publish their model of the DNA double helix. The matter was made possible by Franklin's work.