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.
Gerbil liver VA δ13C‰ (A) and serum retinol δ13C‰ (B) after consuming feeds with different combinations of provitamin A and preformed VA sources. All values are means ± SDs. Labeled means without a common letter differ, P < 0.05. B, baseline; O, orange; VA, vitamin A; W, white.
