 DNA samples of both families were analysed, both revealing a coincidence with the mummy's DNA of over 99.8%.It was thereby proven that Anna Catharina Bischoff, born on 23 March 1719 in Strasburg, was buried on 30 August 1787 in Basel.A direct connection through Anna Catharina Bischoff's son-in-law Christian Friedrich Pfeffel von Kriegelstein leads to the British politician Boris Johnson; his great-grandmother was Marie Luise von Pfeffel.