<human>:  With regards to the history of recombinant DNA, where did the first recombinant DNA experiments take place?
<bot>: The first recombinant DNA experiments took place at the University of Wisconsin in the early 1970s. These experiments involved the genetic engineering of bacteria. The bacteria were genetically modified to produce a protein that was not naturally produced by the bacteria. The researchers were interested in determining how the bacteria produced this protein.