Genetic remnants of unknown ancestors have been found in modern human genes. These ancestors are not represented in the fossil record, making them difficult to identify. Scientists previously discovered that humans interbred with extinct relatives, but some lineages remain unclear. Further research is needed to understand when interbreeding occurred and how these lineages diverged from modern human ancestors.

Details about these genetic "ghosts" are limited, but studies have uncovered hints of their existence. The discovery of these remnants provides clues about human history, but more information is required to unlock the mystery of these unknown ancestors.

More information about this research is available from the source, which may provide additional insights into the genetic history of humans.