Sperm team up and swim in shoals like fish heading upstream in the fallopian tubes to reach a woman's egg, a study has found.Researchers at Cornell University, in Ithaca, New York, and A&T (NC A&T) revealed those in groups were more likely to swim in a straight line and — when there was a current — were less likely to be swept away. But they were not faster than their rivals going it alone.Scientists said the research could help with selecting sperm for use in the fertility treatment in-vitro fertilization (), because the method removes natural checks on weaker sperm found in the female reproductive system.
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