The theory is that big differences come from the way in which certain RNA molecules copy DNA sequences into proteins.

FORBES: Animal Nut

The DNA had been discovered using a new technique called "low copy number DNA".

BBC: Omagh: 10 years on

GenVault keeps a copy of the rice DNA sequences and plate numbers as a backup if the lab workers fear an identity mix-up.

FORBES: The DNA Bar Code

GenVault keeps a copy of the rice DNA sequences and plate numbers as a backup, in case the lab workers fear an identity mix-up.

FORBES: Magazine Article

The cases would specifically involve Low Copy Number (LCN) DNA samples which involve tiny traces of DNA that have only been detectable with new techniques available since 2001.

BBC: DNA sample being taken

DNA. But Dr Romesberg is confident he can improve the copy quality.

ECONOMIST: A new kind of DNA

The opposition Conservatives say that if they win power at the approaching general election they will copy the Scottish system, in which people who are not convicted usually have their DNA removed from the database as soon as the case against them is dropped.

ECONOMIST: The vast police directory is trimmed, but only a little