A mystery engraved in DNA: traces of a "ghost ancestor" are found

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Scientists from the University of Berkeley and Johns Hopkins University have revealed a new secret in the history of the human species: they have found traces from two unknown ancestral lineages in human DNA. These are lineages we did not inherit from Neanderthals or Denisovans, but rather from older species. However, their appearance, where they lived, or which species they belonged to are questions still without an answer.