Chronic exposure to cocaine induces modif icat ions to neurons in the brain regions involved in addict ion. Hence, we evaluated cocaine-induced changes in the hippocampal CAÍ field in Fischer 344 (F344) and Lewis (LEW) rats, 2 strains that have been widely used to study genetic predisposit ion to drug addict ion, by combining intracellular Lucifer yel low injection wi th confocal microscopy rec...