It sounds like the setup to a bad joke: Three couples walk into a fertility clinic. But the punch line—what happened to those families at one Los Angeles medical facility in August 2018—is no laughing matter. The embryos from two couples hoping to conceive were mistakenly implanted into a third patient. That third woman and her husband, both of Korean descent, suspected that something was amiss when their two newborns didn’t look anything like them.

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