Correction: Lincoln had several grandchildren and great-grandchildren, but none of the great grandchildren had children. Who are the descendants referred to here? Descendants of cousins, e.g.?
The story says that the complete study is in the "Journal of Cell Biology," but the journal's website isn't updated yet. I'd be interested to know what relatives they used for the study.
Offspring of his cousins or siblings wouldn't be his "descendants," technically, but one can't expect precise accuracy from the MSM.