Fig 1. Principal component (PC) plot.
The second principal component (PC2) is plotted against the first principal component (PC1). The four separated groups are marked by circles with number 1,2,3 and 4.
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.