Archeologists looked at 151 mummified remains from all walks of life, from lavish priestly burials to simple interments, all found at the Abusir el-Maleq archaeological site some 70 miles south of Cairo. In particular, the researchers zeroed in on mitochondrial DNA of these mummies. The DNA we usually talk about lives in the nucleus of each of our cells, and it comes from each of our parents. Mitochondrial DNA lives in the mitochondria, often called the powerhouse of the cell, and we only get it from our mothers. While it can't tell your entire genetic story, mitochondrial DNA is great for showing genetic changes over time—how different related lineages moved and met around the globe throughout the ages. In this case, they were able to get a clear read on mitochondrial DNA from 90 mummies, while only 3 mummies yielded reliable nuclear DNA sequences.