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Number of cages in which wound due to fights were observed: (a) C57BL/6J (b) CD1, and (c) SCID Beige newly weaned mice after grouping with late pubescent male mice. X-axis shows the condition of the cage, clean or dirty. Z-axis shows whether there were or were no wounds due to fights. White bars indicate cages with one member; grey bars two members and black bar three members’ cages. A total of 30 cages per strain were analyzed—five cages per condition.
