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Fig. 5. Cell survival test for cell clusters 9 and 10. Number of BrdU+ cells in
cluster 9 (A,B) and in cluster 10 (C,D) after 7 days and 14 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) 7 days of social interaction did not affect the number of surviving
BrdU+ cells in cluster 9 (Kruskal–Wallis test for overall difference:
P=0.28). The number of BrdU+ cells in the three experimental groups
doubled relative to that of the age-control animals. (B) After 14 days of
social interaction, dominant animals (D) had significantly more surviving
BrdU+ cells in cluster 9 than subordinate animals (S) but were not different
from isolate animals (I) (Kruskal–Wallis test for overall difference:
*P<0.05 (P=0.029); multiple comparison tests:
PDvsS<0.05; PIvsD and
PIvsS>0.10). Over 14 days of survival time, the number
of BrdU+ cells in the three experimental groups approximately doubled twice
relative to that of the age-control animals. (C,D) The number of cluster 10
BrdU+ cells did not differ among social groups after surviving 7 days (C) or
14 days (D) of social interaction (Kruskal–Wallis test for overall
difference: P7days=0.98,
P14days=0.93). The number of BrdU+ cells in the 7-day
survival groups was similar to that of the age-control animals (C), while the
number of BrdU+ cells in the 14-day survival groups approximately doubled (D).
(Numbers in parentheses indicate the number of animals examined.)
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