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.
Urinary and serum magnesium after 2- to 18-day Space Shuttle flights. The urine data are individual data from a small study evaluating bone and mineral metabolism after flight, whereas the serum data are means ± SD from routine pre- and postflight medical testing, and thus have a much larger n.
