Table 1.

Phospho-ERK average density and percent of p-ERK-labeled excitatory profiles inside the AcbSh of lithium treated (CS⁺-US⁺) and control rats (CS⁺-US⁻) obtained pooling the results from rats sacrificed at 3 and 23 min after the beginning of test.

CS+ - US−		CS+ - US+
A + B: samples sacrificed at 3 and 23min after start of expression test		A + B: samples sacrificed at 3 and 23min after start of expression test
p-ERK average density		p-ERK average density
Nuclear	Cytoplasmic	Nuclear	Cytoplasmic
Mean ± s.e.m.	Mean ± s.e.m.	Mean ± s.e.m.	Mean ± s.e.m.
0.58 ± 0.03	0.17 ± 0.02	0.93 ± 0.05**	0.18 ± 0.04
% p-ERK-labeled excitatory profiles		% p-ERK-labeled excitatory profiles
25.5 ± 3.7		31.6 ± 4.4**

pERK positive synaptic profiles values are expressed as percentage of p-ERK-labeled excitatory profiles out of the total number of excitatory profiles;

^**Indicate respectively significant differences (p < 0.01) of average density gold particles and number of pERK labeled excitatory profiles (%) between US⁻ and US⁺ rats (One-Way ANOVA).