Ryukyuan people
According to several studies, the Ryukyuan people share more alleles with the Jōmon period (16,000–3,000 years ago) hunter-gatherers and Ainu people than the Yamato Japanese, have smaller genetic contributions from Asian continental populations, which supports the dual-structure model of K. Hanihara (1991), a widely accepted theory which suggests that the Yamato Japanese are more admixed with Asian agricultural continental people (from the Korean Peninsula) than the Ainu and the Ryukyuans, with major admixture occurring in and after the Yayoi period (3,000-1,700 years ago).