Dr Ignacio Madrazo, photographed in his office at La Raza Medical Centre, Mexico. In september 1987, Madrazo's collaboration with Dr Rene Drucker resulted in the transplantation of brain tissue from an aborted human foetus into the brain of a person suffering from Parkinson's disease. The Mexicans have subsequently claimed an improvement in the symptoms of the disease. Victims of Parkinson's disease have great difficulty in controlling their movement, due to a failure in the production of dopamine, a chemical required by one of the brain's motor control centres. Grafting of dopamine-containing foetal cells is intended to restore the deficiency.