Comparison of behavioral motor effects elicited by acute stress in open-field test. A, Horizontal activity estimated as the number of grids crossed during a 3-minute test. B, The frequency of rearing with hind legs during a 3-minute test. The data were obtained one day before sacrificed. Data are expressed as mean ± SEM (n = 8). ▲P<0.05 and ▲▲P<0.01 compared with the normal group.