 Analysis of DNA extracted from a tooth from what are believed to be the remains of Cao Ding shows that he belonged to this clade.The researchers also found that the Y-chromosome of Cao Ding matches those of self-proclaimed living descendants of Cao Cao who hold lineage records dating back to more than 100 generations ago.Cao Cao laid the foundation of Cao Wei, one of three major states that succeeded the Han Dynasty of China.