Mice were exposed to 7 days (A), 14 days (B), or 21 days (C) of stress followed by behavioral assessments on each group. Only mice exposed to 7 days of stress displayed minor depressive-like behavior in splash test and novelty suppressed feeding (NSF) test, but not in forced swim test (FST). Mice exposed to 14 days or 21 days of stress displayed a stress habituation phenotype. For splash test and FST, * p<0.05, ** p<0.01 by two-tailed unpaired t-test. For NSF test, statistical significance was determined by two-tailed unpaired t-test corrected for multiple comparisons using Holm-Sidak method. * p<0.05, n=10–12 mice per group. Data represented as mean ± S.E.M.