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In extremely rare cases, human sperm may be able to travel up the fallopian tube, pass through the ovarian tissue, and enter an intact ovarian follicle, allowing it to reach the ovum and fertilize the egg before ovulation takes place.

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Fun Fact:

In extremely rare cases, human sperm may be able to travel up the fallopian tube, pass through the ovarian tissue, and enter an intact ovarian follicle, allowing it to reach the ovum and fertilize the egg before ovulation takes place.

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pubmed.ncbi.nlm.nih.gov

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