Figure 1.
Study design. A, Number of human PET scans at different daylengths (1 bin = 0.5 h). B, Experimental design for the rat model PET study. M, Males; F, females.
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.