Nine skeletons found in a shallow grave in Ekaterinburg, Russia, in Ju
ly 1991, were tentatively identified by Russian forensic authorities a
s the remains of the last Tsar, Tsarina, three of their five children,
the Royal Physician and three servants. We have performed DNA based s
ex testing and short tandem repeat (STR) analysis and confirm that a f
amily group was present in the grave. Analysis of mitochondrial (mt) D
NA reveals an exact sequence match between the putative Tsarina and th
e three children with a living maternal relative. Amplified mtDNA extr
acted from the remains of the putative Tsar has been cloned to demonst
rate heteroplasmy at a single base within the mtDNA control region. On
e of these sequences matches two living maternal relatives of the Tsar
. We conclude that the DNA evidence supports the hypothesis that the r
emains are those of the Romanov family.