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Selected reproductive traits in the Collaborative Cross (CC) extinct population and the CC founders. Symbols beside strain labels (*) reflect simplified categorical significance differences using a Student’s t-test. (A) Mean sperm count per mouse (millions of sperm). (B) Percent of sperm that were motile. (C) Mean value for curvilinear velocity (VCL, µm/sec). (D) Percent of sperm with normal morphology.
