HARTFORD, Conn. — Graduate dental school students and a top University of Connecticut orthodontics professor took a selfie with two severed heads used for medical research at a training workshop at Yale University last year – an episode Yale officials called “disturbing” and “inexcusable.”

The selfie was taken in June at the Yale School of Medicine during the 2017 DePuy Synthes Future Leaders Workshop, which focused on dental-related facial deformities.

The Associated Press obtained a copy of the photo. The people in the photograph include Dr. Flavio Uribe, an assistant professor and orthodontics program director at UConn Health and a visiting associate professor at the Yale School of Medicine. In the photo, Uribe and several graduate students are looking at the camera, while others continue to work. All are wearing surgical masks. The two severed heads are on tables, face up.

Uribe said he was teaching students how to place screws in the cadaver heads. At one point, he said, someone took a photo.

“Somebody unfortunately took a photo,” Uribe said. “It was so quick. I wasn’t sure of the surroundings or scenery at that point.”

Officials at Yale and UConn Health said the universities have taken steps to ensure it doesn’t happen again. Yale officials said they are improving oversight at such training events and making participants agree in writing to ethical standards of conduct.

Yale spokesman Thomas Conroy said the School of Medicine took the matter very seriously. He said there is clear signage forbidding photography.