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.
Electron microscopy showing an aggregate of spherical VLPs with densely stained cores (arrows) and spike-covered influenza virus virions, negatively stained with sodium phosphotungstate stain. Magnification, ×40,000 (two times enlarged from the original picture for clear presentation).
