https://www.nod1inhibitor.com/2015/11/01/no-reversions-to-the-ancestral-point-out-have-been-noted-at-np-16051-for-any-c1d-sequences-on-the-other-hand-reversions-at-np-194-seem-to-be-frequent-but-there-are-not-noticed-in-subhaplogroup-c1d3/