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Each symbol corresponds to a single mouse. Generation-specific means are indicated (horizontal lines). Each mean was significantly different from the other three (p<0.001). Means ± SEM: 2.94±0.09 (SJL/J), 6.77±0.09 (129/Sv), 5.53±0.1 (F1) and 5.17±0.07 (F2).
