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.
Progress of structure determination. (a) Initial potential map after symbolic addition. (b) Map after first structure-factor calculation. (c) Map after second structure-factor calculation. (d) Map after third structure-factor calculation. (e) Structure determined by electron microscopy (13). Helix positions are numbered (to match to those given in Table 2).
