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.
Alignment, classification and averaging of particle images reveals structural details of the heptameric complex. (a) Reference-free alignment and k-means classification of 9,028 particle images into 90 classes resulted in the depicted class averages. The number of particles constituting each class is indicated. (b) A well-defined class average is shown and prominent features are named. Scale bar, 100 Å.
