Amerindian mitochondrial DNAs have rare Asian mutations at high frequencies, suggesting they derived from four primary maternal lineages

le Schurr, Theodore G., Ballinger, Scott W., Gan, Yik Yuen, Hodge, Judith A., Merriwether, David Andrew, Lawrence, Dale N., Knowler, William C., Weiss, Kenneth M., Wallace, Douglas C.
Foilsithe 1990