excerpt from link above:
A trial is underway at University College London Hospitals in UK to establish whether the drug 'Exenatide' could be used to treat patients with the progressive neurological condition.
A synthetic version of this drug, originally found in the saliva of the Gila monster, is already an approved treatment for patients with diabetes.

However, laboratory evidence suggests it could also arrest the neurodegenerative process that causes Parkinson’s disease - potentially leading to a cure. Four independent groups around the world (including colleagues at the School of Pharmacy, London), have shown that this drug can improve symptoms of Parkinson’s and rescue dying cells in five different rodent models of the disease

Oh yes; I will rush right down to Mexico and try this treatment (NOT!)
Fiona, note those "dying cells.

Oh, if only we were rodents.

Peg"