A chemical found in sharks can block the process that leads to Parkinson's Disease, scientists at Cambridge University have found. Know as squalamine, the substance prevents a protein called alpha-synuclein from accumulating on and damaging the membranes of nerve cells in the brain. Dosing with squalamine protected cells cultured in a dish as well as microscopic worms that have been genetically altered to make them develop a Parkinson's-like syndrome. Chris Dobson explains... Like this podcast? Please help us by supporting the Naked Scientists