when did scientists discover dna
DNA was first crystallized in the late 70's â remember, the 1953 X-ray data were from DNA fibers. So, the real proof for the Watson-Crick model of DNA came in 1982 after the B-form of DNA was crystallized and the X-ray pattern was solved. If the DNA of one human cell is stretched out, it would be almost 6 feet long and contain over three billion base pairs.