Figure 6.
Hierarchical breakdown for research on disease (the dark rectangle shows the level 1, and the dotted rectangles are showing subcategory).
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.