"The cell kicks out foreign DNA, " said Harvard's Dr. Church.

WSJ: Harvard Researchers Turn Book Into DNA Code

Thus, the researchers reckon that when a tumour cell is under pressure from foreign toxins it starts to make more vaults to help get rid of the unwelcome molecules.

ECONOMIST: Cell biology: The secret of the vaults | The

The U.S. military also announced the Wednesday arrest in northern Arab Jabour of a man described as a foreign fighter who heads a car-bombing cell network.

CNN: Execution, body dumping site found south of Baghdad

The last hot air balloon accident in Luxor occurred in 2009, when 16 foreign tourists were injured after a balloon struck a cell phone transmission tower.

CNN: Deadliest balloon crash in decades kills 19 in Egypt

According to ABC's Foreign Correspondent programme, Ben Zygier was found hanged in a cell in late 2010, months after he was imprisoned, and his body flown to Melbourne for burial the following week.

BBC: Israel's mystery Prisoner X 'was Australian Ben Zygier'

Mr Martin has called on Madrid to set up a "crisis cell" made up of the ministries of interior, foreign affairs and defence among others to tackle the problem.

BBC: Migrant centres on the islands are reaching full capacity

This combined treatment created a kind of "peacekeeping" immune cell, which appeared able to avert the attack on the foreign organ.

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Later, at the press conference with Berlusconi, Bush said that John Paul had not raised stem cell research during their private session, but had instead focused on foreign policy and Bush's meeting on Sunday with Russian President Vladimir Putin.

CNN: Bush to visit Kosovo troops