Cocaine self-administration in C57 and DBA mice in a study where both strains acquired at 1 mg/kg/infusion.

<p>The graph shows the number of self-infusion on the last 5 days of acquisition (day 6–10) and the transition to a 0.5 mg/kg/infusion dose (day 11–14). At the 0.5 mg/kg dose, DBA mice show a number of self-infusions that is comparable to that of the C57 mice at the 1 mg/kg/infusion dose. Symbols represent mean±SEM. C57 (squares) <i>n</i> = 8, DBA (triangles) <i>n</i> = 5.