"Increased p-FAK expression in <t>D1-MSN</t> and D2-MSN, but p-cofilin only showed increased expression in D1-MSN during cue-induced cocaine seeking. p-FAK colocalization: A, D, Dendritic segments in NAcore labeled with mCherry-ChR2 (green, pseudo-colored images) in D1-MSN and D2-MSN and p-FAK (red) in each treatment group [saline (SAL), extinguished (EXT), reinstated (RST)]. Micrograph pairs of each segment depict the confocal imaging showing p-FAK puncta and labeled dendrites (left), and p-FAK puncta within the dendrite (right). Scale bar = 5 µm. B, Increased dendritic p-FAK immunoreactivity within D1-MSN dendrites in reinstated group compared with saline and extinguished animals. C, Positive correlation between p-FAK puncta expression within D1-MSN dendrite and active lever presses during 15-min cue-induced reinstatement. E, Increased dendritic p-FAK immunoreactivity within D2-MSN dendrites in reinstated group compared with saline and extinguished animals. F, No correlation between p-FAK puncta expression within the D2-MSN dendrite and active lever presses during cued reinstatement. p-cofilin colocalization: G, I, Dendritic segments in NAcore labeled with mCherry-ChR2 (green, pseudo-colored images) in D1-MSN and D2-MSN and p-cofilin (red) in each treatment group (SAL, EXT, RST). Micrograph pairs of each segment depict the confocal imaging showing p-cofilin puncta and labeled dendrites (left), and p-coflin puncta within the dendrite (right). Scale bar = 5 µm. H, Increased dendritic p-cofilin immunoreactivity within D1-MSN dendrites in reinstated group compared with saline and extinguished animals. J, No significant difference observed in p-cofilin puncta expression in D2-MSN dendrites. Data are shown as mean ± SEM N represents number of neurons quantified over number of animals in each condition; *p < 0.05 comparing RST to SAL; #p < 0.05 compared RST to EXT using Bonferroni post hoc. "