* Researchers say a new drug helps brain cells in animals to regenerate following damage and could be useful in treatment of Parkison's disease. - GPI-1046 was tested on mice and found to protect nerves from damage and cause brain cells to regenerate. - Johns Hopkins University researchers say in animals whose sciatic nerves were crushed, GPI-1046 accelerated recovery of the damaged nerves. - Guilford Pharmaceuticals makes the drug and says it "may represent a significant new approach to the treatment of neurodegenerative disorders such as Parkinson's disease." - report is in the March edition of the Proceedings of the National Academy of Sciences.