 Scientists in the early 1990s were unable to identify Dr. Botkin using mitochondrial DNA, or DNA that is passed down from mother to child, as they used it to identify the Romanovs.Schweitzer was descended from Dr. Botkin in the paternal line and didn't share mitochondrial DNA with her father and grandfather.Schweitzer later expressed scepticism about the DNA results proving that Anna Anderson could not have been the Grand Duchess Anastasia.