Three non-human primates (NHP) were assessed using a modified UPDRS (mUPDRS) protocol (max score = 42). Composite scores within the ranges of 3-13, 18-28, and 32-42 were used to define three different levels of parkinsonian severity: mild, moderate, and severe parkinsonian states, respectively. A. Mean+/−Standard deviation of the composite mUPDRS for the three subjects. B. Median mUPDRS score for the limb contralateral to the intra-carotid injections, separated by symptoms.