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.
Mean percent control responding (contingent histamine injections with saline pretreatment) for the sucrose-plus-injection (inj) lever and sucrose-alone lever as a function of antagonist dose for the Pyrilamine (left), Ketotifen (middle), and Ranitidine (right) rats with the differential-reinforcement procedure in Experiment 2. Error bars are SEM.
