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Tulane University freshmen Emily Nappi (left) and Mikayla Stern-Ellis (right) discovered that they share a father, who was a sperm donor. (Credit: The Tulane Hullabaloo/Claire Brown)

Tulane University freshmen Emily Nappi (left) and Mikayla Stern-Ellis (right) discovered that they share a father, who was a sperm donor. (Credit: The Tulane Hullabaloo/Claire Brown)