From the article: > In the interim, scientists had discovered that that type of hormone treatment they got could unwittingly transfer bits of protein into reci

From the article: > In the interim, scientists had discovered that that type of hormone treatment they got could unwittingly transfer bits of protein into recipients’ brains. In some cases, it had induced a fatal brain disease called Creutzfeldt-Jakob disease, or CJD — a finding that led to the banning of the procedure 40 years ago.