Brownstone was a common material for markers back then.

Some families paid for larger markers with more inscriptions.

They wanted us to search for specific markers and combinations of alleles most often used to determine parental relationship.

They had to use only the red stones for grave markers.

Now all three terms are also used for markers placed at the head of the grave.

Looking for racial genetic markers does indeed risk creating categories that can get us in trouble.

David later said, "Those people had no money or time for markers.

It was difficult for both participants and markers.

Tests for other markers are more expensive and hard to get.

He and his colleagues are searching for such markers.