Table 2. Number (±SEM) of c-Fos Positively Labeled Nuclei by Groups and Regions Tested.

	0.4 mg/kg Nicotine			Vehicle
	nicotine-CS	chamber-CS	CS-alone	nicotine-CS	chamber-CS	CS-alone
Prefrontal Cortex
PrL	39.63±6.39	35.67±8.62	36.69±6.42	19.58±3.21	23.41±4.46	23.91±3.24
OFC	106.56±15.92	91.81±18.41	100.54±9.20	78.38±12.60	69.25±14.59	57.09±14.02
Cg2	39.00±6.45	31.21±8.51	25.83±3.67	16.00±2.84	12.59±3.97	15.77±3.04
Striatum
dmCPu	39.96±6.32	26.54±5.54	25.96±3.61	8.83±1.17	10.57±2.37	9.00±2.22
dlCPu	9.50±2.44	5.48±1.54	3.94±0.86	2.10±0.54	5.18±2.46	2.93±0.64
vmCPu	45.63±6.68	31.00±5.94	29.81±5.72	17.31±2.31	17.59±4.16	14.25±3.07
vlCPu	9.56±2.32	6.90±2.15	4.77±1.07	3.19±1.08	4.89±2.46	4.11±1.05
AcbC	41.63±6.12	38.48±6.80	30.02±4.78	21.44±3.33	20.55±3.94	16.68±2.94
AcbSh	23.31±4.19	18.19±4.64	17.38±2.86	9.77±1.46	9.84±1.76	10.20±1.78
Hippocampus
CA1	8.31±1.53	7.27±1.70	9.04±1.66	5.35±1.10	4.82±1.56	7.02±1.63
CA2	8.77±1.83	7.58±1.79	7.25±1.47	8.15±1.89	5.23±1.78	6.98±2.07
CA3	9.08±1.93	6.71±1.25	6.35±1.48	7.21±1.07	5.23±1.55	7.09±2.52
DG	17.70±5.02	15.27±3.03	12.68±3.41	12.20±3.50	8.07±1.96	11.26±3.41
Amygdala
CeM	12.81±4.03	11.46±1.45	11.04±3.09	7.08±1.49	5.11±0.69	6.39±1.49
BLA	10.44±2.18	13.15±2.48	9.13±2.13	5.10±1.06	4.70±0.59	4.70±0.78
MeAD	14.94±2.31	15.29±2.41	12.33±1.51	9.79±1.97	10.20±1.47	12.30±2.10
Other areas
VP	17.05±2.50	18.96±4.94	12.15±1.27	8.63±2.52	7.11±1.37	6.05±0.96
VTA	26.02±3.55	22.04±3.48	18.96±2.77	18.17±2.45	10.91±1.97	16.48±3.61
SNR	9.69±1.95	6.77±1.46	5.50±1.39	3.33±1.18	6.64±3.00	7.36±3.11