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With dark surroundings, a human-like character approaches a white door.

SALT LAKE CITY — Details about the baby born with the help of spindle nuclear transfer, known as the "three-parent baby," were revealed during a late-breaking session here at the American Society for Reproductive Medicine 2016 Scientific Congress.

Reactions ranged from dismay to admiration.

Condemnation for "changing the heredity of humans forever" came from Ke-Hui Cui, MD, PhD, from The Georgia Center for Reproductive Medicine in Savannah. And praise and support for the team's "good work," came from Kutluk Oktay, MD, PhD, from New York Medical College in Valhalla.

The baby, conceived with a "reconstituted" oocyte, is now 6 months old, and "no complications or abnormalities" are evident, said team leader John Zhang, MD, PhD, from the New Hope Fertility Clinic in New York City.

The procedure was performed at New Hope's site in Guadalajara, Mexico, to bypass the American ban on mitochondrial manipulation.

"Everything in Mexico was done within the regulatory frame that allows for these fertility treatments," said Alejandro Chavez-Badiola, MD, medical director at the Mexican clinic.

"We are in touch with the authorities and have...