File photo - Hyperrealistic face of a neanderthal male is displayed in a cave in the new Neanderthal Museum in the northern Croatian town of Krapina Feb. 25, 2010.(REUTERS/Nikola Solic)

The calcite-encrusted skeleton of an ancient human, still embedded in rock deep inside a cave in Italy, has yielded the oldest Neanderthal DNA ever found.

These molecules, which could be up to 170,000 years old, could one day help yield the most complete picture yet of help paint a more complete picture of Neanderthal life, researchers say.

Although modern humans are the only remaining human lineage, many others once lived on Earth. The closest extinct relatives of modern humans were the Neanderthals, who lived in Europe and Asia until they went extinct about 40,000 years ago. Recent findings revealed that Neanderthals interbred with ancestors of today's Europeans when modern humans began spreading out of Africa 1.5 to 2.1 percent of the DNA of anyone living outside Africa today is Neanderthal in origin. [Image Gallery: Our Closest Human Ancestor]

In 1993, scientists found an extraordinarily intact skeleton of an ancient human amidst the stalactites and stalagmites of the limestone cave of Lamalunga, near Altamura in southern Italy a discovery they said had the potential to reveal new clues about Neanderthals.

"The Altamura man represents the most complete skeleton of a single nonmodern human ever found," study co-author Fabio Di Vincenzo, a paleoanthropologist at Sapienza University of Rome, told Live Science. "Almost all the bony elements are preserved and undamaged."

The Altamura skeleton bears a number of Neanderthal traits, particularly in the face and the back of the skull. However, it also possesses features that usually aren't seen in Neanderthals for instance, its brow ridges were even more massive than those of Neanderthals.These differences made it difficult to tell which human lineage the Altamura man might have belonged to. Moreover, the Altamura skeleton remains partially embedded in rock, making it difficult to analyze.

Now, new research shows that DNA from a piece of the skeleton's right shoulder blade suggests the Altamura fossil was a Neanderthal. The shape of this piece of bone also looks Neanderthal, the researchers said.

In addition, the scientists dated the skeleton to about 130,000 to 170,000 years old. This makes it the oldest Neanderthal from which DNA has ever been extracted. (These bones are not the oldest known Neanderthal fossils the oldest ones ever found are about 200,000 years old. This isn't the oldest DNA ever extracted from a human, either; that accolade goes to 400,000-year-old DNA collected from relatives of Neanderthals.)

The bone is so old that its DNA is too degraded for the researchers to sequence the fossil's genome at least with current technology. However, they noted that next-generation DNA-sequencing technologies might be capable of such a task, which "could provide important results on the Neanderthal genome," study co-author David Caramelli, a molecular anthropologist at the University of Florence in Italy, told Live Science.

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Oldest Neanderthal DNA