An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Stereologic Estimates of (A) melanin-containing and (B) tyrosine hydroxylase-immunoreactivity (TH-ir) neurons in patients with Parkinson’s disease (PD) of the whole SNc at different disease durations (n = 20).