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.
The superposition of S1 (white) with its structure neighbors: 1INY (neuraminidase from influenza A virus, blue) and 1B9T (neuraminidase from influenza B virus, yellow) (for interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.).
