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.
(A) Two Ca2+ binding sites of N1 NA, with interacting residues shown as sticks. (B) The active site of NA. Highly conserved residues involved in direct substrate binding are shown as green sticks, and surrounding conserved residues are shown as orange sticks.
