To assess aggressive behavior in mice, we used the RI test. The day before and during the RI test, the bedding of cage-resident mice was not renewed. The resident mice were given five 0.1-mA footshocks (as acute stress) 30 min before the RI test. The intruder, a male BALB/c mouse, was placed into the home cage of the resident mice for 15 min. A Sony digital camera (HDR-XR150) recorded videos. The number of attacks was defined by the bites of the resident mice to the intruder.
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