Fig. 2.
Principal component analysis of the amino acid usage frequencies of the ORF2 gene. The relative and cumulative inertia of the first 20 factors are shown based on principal component analysis.
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.