Globe Newswire:Prothena Reports Robust Reduction of Free Serum Alpha-Synuclein of up to 96% After Single Dose of PRX002, a Novel Protein Immunotherapy for Parkinson's Disease Prothena Reports Robust Reduction of Free Serum Alpha-Synuclein of up to 96% After Single Dose of PRX002, a Novel Protein Immunotherapy for Parkinson's Disease