Furthermore, they interpret the low genetic contributions of Taiwanese aboriginals to ISEA mtDNA lineages as evidence that Taiwanese aborigines did not contribute significantly to the later southward expansion. Rather the expansion was largely the spread of rice-farming Austronesians from south China passing through Taiwan at around 7000 to 6000 years ago before entering ISEA again at around ~4.5 thousand years ago. They propose that the admixture of Austronesian genes in Taiwanese populations happened after the Austronesian expansion from southern China, rather than before it.