In a bid to mimic the effects of Parkinson's disease, a London medical research team injected 22 marmoset monkeys with a potent brain poison every day for five days. After the last dose, none was able to move. They sat hunched, mute and rigid in their cages, so severely disabled that they had to be hand-fed. The monkeys were then given the illegal party drug Ecstasy in the hope that it might provide insights into chemical pathways within the brain. None of this research proved beneficial to humans; rendering the suffering of the monkeys valueless. This experiment was part funded by the medical charity Parkinson's UK.