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Fig. 4. Cell proliferation test for cell clusters 9 and 10. Number of BrdU+ cells
in cluster 9 (A–C) and in cluster 10 (D–F) after 1 (A,D), 7 (B,E)
and 14 (C,F) days of social interaction. Values are the sum of labeled cells
from the two bilateral cell clusters 9 or 10 of a brain, and expressed as
median ± interquartile range. (A,D) After 1 day, the number of BrdU+
cells did not differ for dominant (D), subordinate (S) and isolate (I) animals
(Kruskal–Wallis test for overall difference:
Pcluster9=0.87; Pcluster10=0.32).
(B,E) After 7 days, isolated animals had significantly more BrdU+ cells in
cluster 9 than subordinate animals but not more than dominant animals
(Kruskal–Wallis test for overall difference: *P<0.05
(P=0.02); multiple comparison tests:
PIvsS<0.05; PIvsD and
PDvsS >0.05). There was a non-significant trend for the
isolates to have more BrdU+ cells in cluster 10 than subordinate and dominant
animals (Kruskal–Wallis test for overall difference: P=0.03;
multiple comparisons test: PIvsD is >0.05 and
PIvsS <0.10; PDvsS>0.10. (C,F)
After 14 days, the number of BrdU+ cells did not differ among the groups
(Kruskal–Wallis test for overall difference:
Pcluster9=0.64; Pcluster10=0.91).
(Numbers in parentheses indicate the number of animals examined.)
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