Did Prince Philip of Great Britain, then, donate a second blood sample for mitochondrial DNA testing? I know he did the first time around -- thereby enabling the investigators to identify some of the Romanov remains. But since the second discovery was made later, I would assume that a second donation would have had to be made. Certainly there is no dearth of living relatives who share the same DNA with the Czarina Alexandra and her children.
There are fewer living persons sharing the same mitochondrial DNA with Czar Nicholas II; but they do exist. Did any such relatives donate any blood sample for testing? I hear that the Russians were eager enough to identify the Romanovs, so as to exhume the body of his father, Czar Alexander III, to compare the Y-chromosome DNAs. But such a move would have been unnecessary and cumbersome: it's easier to track down living maternal collateral descendants, than to disturb the remains of a dead person.
Of course, it takes more than just DNA to specifically identify any corpse: I believe photographic analysis got used (such as examining facial bone structure), to piece together the different skeletons and establish the various identities.
Is it true that the forensic analysts went one step further and used modern molecular biology to determine facts such as gender and age at death, when examining the bones?