Ovarian resequencing

Ovarian resequencing is a medical process in which imcompatable gametes are modified to allow conception.

In 2374, Jadzia Dax read an article on interspecies conception and theorized that Jem'Hadar DNA could be altered in a similar way and make them less aggressive. (SS DS9 (The Devil You Know))

Later that year, Julian Bashir began giving Dax ovarian resequencing enzymes to allow her and Worf to have a child. The enzymes had begun to work before Jadzia was killed by Dukat.