Figure 3.
SEM images of GA (a,b), HGA1 (c,d), and HGA3 (e,f).
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.