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David Harewood who stars in the film 'Blood Diamond' signed up to become a bone marrow donor and this is his donor's tale.

He's a bit apprehensive about the process which involves receiving injections, being hooked up to a dialysis machine and, all being well, producing the stem cells needed to save someone's life.

David isn't allowed to know who the patient is, but within 14 days the nurses will know if the patient will recover.

"Four days in which I've hopefully managed to save someone's life," he says,  “The only way you can give them that helping hand is to get yourself on the register and donate your stem cells, donate your bone marrow.”

The overwhelming message from David Harewood after the process -- take action, get yourself on the bone marrow register!

The Anthony Nolan Trust is encouraging more individuals aged between 18-40 years to find out how to join the register. If you want to find out more, contact Anthony Nolan Trust on 020 7284 1234 or visit www.anthonynolan.org.uk