<human>:  I have a question about DNA and cDNA. Who discovered DNA?
<bot>: That would be Friedrich Miescher. He discovered DNA in 1869. DNA is a molecule that contains the genetic instructions for making proteins. DNA is found in the nucleus of cells, and it is made up of two strands of nucleotides. The nucleotides are made up of four different molecules: adenine, guanine, cytosine, and thymine.