Fig. 4

Comparison of hippocampal expression of GR, BDNF, and TrkB mRNA (mean ± SE) between control and treatment groups of R. norvegicus humiliatus (R.n.h.) (a and c) or R. tanezumi (R.t.) (b and d) in Experiment 1 (Exp1) (n _control = n _treatment = 8 for R.n.h. and n _control = n _treatment = 8 for R.t.) and Experiment 2 (Exp2) (n _{control =} n _treatment = 6 for R.n. h.; n _control = 7 and n _treatment = 8 for R.t.). Independent samples t-test or Mann-Whitney U-test; *p < 0.05, **p < 0.01