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A woman is attempting to break a world record for running the London Marathon dressed as a blood stem cell.
Louise Cato from Somerset is doing the run to raise money for the charity Anthony Nolan, after her dad had a bone marrow transplant over 30 years ago.
Ms Cato is dressing as a cell in a Guinness World Record attempt for "fastest marathon dressed as a cell", where she will be aiming to beat a time of 4 hours and 30 minutes.
"I hope by dressing like an idiot I can raise awareness and some money for charity," Ms Cato said.
