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.
A subimage segmented into four colors. A positive subimage (a) and its four-color-segmented (white, blue, red, brown) corresponding (b) are shown. This subimage has a mature vessel around center. In (b), same region is segmented mainly two regions, red and brown.
