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Aggressive behavior performed toward younger and smaller intruders. Experimental animals (Subjugated,n = 17) were exposed daily to aggressive adult males from P28 to P42, whereas control hamsters (n= 17) were placed in empty clean cages. The subjects (Control or Subjugated) were tested for a 10 min period on P45. *p < 0.05, Student’st test; **p < 0.01, Mann–Whitney test.
