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.
Adrenal weight (A) was increased in morphine-treated rats 12 hr and 8 d after the last injection, whereas thymus weight (B) was decreased in morphine-treated rats 8 d after the final injection, but was normal 12 hr after the final morphine injection. The results are expressed as means ± SEM (n = 18 rats per group). *p < 0.05 indicates significant effect of morphine versus saline treatment.
