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Body weights (mean ± SEM) in mice from different housing conditions. The results from B6 (A, male; D, female) mice are included as examples of typical weights in wild-type mice. (B) BALB/c and (C) 129/Sv male mice. (E) BALB/c and (F) 129/Sv female mice. Value differed significantly (P < 0.05) from that for (*) the nest-only group or (#) both other enrichment conditions.
