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.
Time course effects in locomotor activity tests for (1) morphine, (2) fentanyl, (3) beta-methylfentanyl, (4) para-methylfentanyl, (5) para-methoxyfentanyl, (6) fentanyl carbamate, (7) 3-furanylfentanyl, (8) phenylfentanyl, and (9) beta′-phenylfentanyl. Symbols represent the mean (± SEM) distance traveled (cm) in 10-min bins for n = 8–16 mice per dose.
