Figure 1.
Geographical locations of sample collection sites. The yellow dots indicate the geographical locations at which the samples were collected in this study. The yellow asterisk indicates the location of the capital of China.
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.