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.
Difference maps at 6 Å resolution between projection maps of MjNhaP1 2D crystals grown without sodium at different pH: (A) pH 4 minus pH 6; (B) pH 8 minus pH 6; and (C) pH 4 minus pH 8. (D) Helix assignment as in Figure 2B. Blue contours indicate positive differences, negative differences are shown in red.
