A stem cell trial treating heart attack patients will help to see if their "natural environment" can treat the disease. Co-researcher Professor John Martin, from University College London, said:
This trial brings together a powerful partnership of European doctors and scientists to solve a fundamental problem of importance to all people. It will give an answer about whether adult multi-potential stem cells in their natural environment can treat human disease.
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Before the final declaration on Friday, the Conservative candidate looked set to lose the City Hall race to Labour's Sadiq Khan.
The Tooting MP has been the frontrunner in the counting process ahead of Tory challenger Zac Goldsmith.
It's not just London where elections have been taking place today. There were council elections taking place across the home counties.