via The Conversation, 17 October 2017:
Using mitocondrial DNA, we found haplogroups M, F, Y2 and B in the western part of Indonesia. The people of these haplogroups are mostly speakers of Austronesia languages, spoken in Southeast Asia, Madagascar and Pacific Islands.
Meanwhile in the eastern part of Indonesia we found haplogroups Q and P. These two haplogroups are unique to people of Papua and Nusa Tenggara. People of haplogroup Q and P are non-Austronesian speakers.
What’s more interesting is Mentawai and Nias, the haplogroup of the people in those islands are grouped with the native people of Formosa, Austronesian speakers who travelled to the south around 5,000 years ago.