TH and Parkinson disease: While TH-absence was observed at the 6-OHDA-injected site in untreated PD rats (16.4% compared with contralateral site), GDNFp-cMBs+FUS treatment successfully recovered dopaminergic neurons characterized by dense TH stains observed at the SN (80.2% compared with contralateral site), whereas recovery of the dopaminergic neurons was not observed in the cMB+FUS+GDNFp treatment group (41.0% compared with contralateral site) (Fig. 5C).