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‘Game of Thrones’ offers medical lessons in genetics, incest, and infertility

As Game of Thrones winds down, and the body count ramps up, one of the plot threads that lives on and on is incest within the royal families.

This photo released by HBO shows Kit Harington as Jon Snow, left, and Emilia Clarke as Daenerys Targaryen in a scene from "Game of Thrones," which premiered its eighth season on Sunday.  (HBO via AP)
This photo released by HBO shows Kit Harington as Jon Snow, left, and Emilia Clarke as Daenerys Targaryen in a scene from "Game of Thrones," which premiered its eighth season on Sunday. (HBO via AP)Read moreAP