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In Parkinson's disease (PD), the consequence of dopaminergic denervation is an imbalance in the activity of the direct and indirect striatofugal pathways, which include potentially important changes in opioid peptide expression and/or activity. The systemic administration of a novel glycosylated opioid peptide MMP-2200 (a.k.a. lactomorphin) was shown to have potent effects in two standard models of...