Autoradiograph of Thomas Jefferson's relatives

Autoradiograph made by Dr. Mark Jobling at Leicester University, 1998. Used to investigate whether the US President, Thomas Jefferson, fathered children with his slave, Sally Hemmings. It compares the DNA of the male descendants of Sally Hemmings with that of the male descendants of Jefferson's paternal uncle (as Thomas Jefferson had no legitimate sons), and finds a DNA match, suggesting that Jefferson had a least one son with Sally Hemmings (see note).