Chart 1.
Structures of radiotracers (1 – 18) used in this study. References to the radiotracers are given in parentheses.
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.