About 12% of pregnancies begin as multiples, but fewer than 2% reach full term. Vanishing Twin Syndrome occurs when one embryo stops developing and is absorbed, leaving a single surviving baby.

Following years of thinking they were fraternal twins, the test showed that they're in fact ... for the girls to know if they share 100 percent DNA," she continued. Alongside the clip, she wrote ...

the two had an emotional reunion that any long-separated identical twins can have. When it was clear to both families that their appearance had all hallmarks of resemblance, a DNA test came calling.

His brother Mark, who is a retired astronaut, is his identical twin and has the same DNA. This provided a never ... with multiple assays and genomics testing. Additionally, a new finding is ...