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.
Effects of cumulative doses of cocaine in three groups of rats treated with saline and tested approximately 18 months apart (saline 1, saline 2, saline 3). Left, locomotor activity expressed as a percentage of saline control values. Right, AUC estimates for each group. Vertical lines, S.E.; where not indicated, the S.E. fell within the data point.
