Ancient protein analysis of cranial fossils from the Xujiayao site in northern China has revealed the distinctive facial features of the Denisovans. Published on October 21, 2026, in Nature, the study links preserved molecular signatures to a rich fossil assemblage, offering researchers their first clear anatomical framework for our extinct human cousins.
For nearly two decades, science knew the Denisovans mostly from microscopic genetic traces and a handful of isolated bones. First identified from a single finger bone found in Denisova Cave in 2008, this enigmatic human lineage left behind DNA that still lives on in modern populations, from Tibetans adapting to high-altitude air to Indigenous groups across the Americas. Yet researchers lacked a reliable physical blueprint.
That began to shift when scientists tied a near-complete skull from Harbin, northeastern China, to the Denisovan family tree. Now, a new multi-institution study has unlocked an even larger collection of human remains, transforming a faceless genome into an ancient group with recognizable bones, teeth, and jaws.
Unlocking the Xujiayao Fossil Collection with Ancient Proteins
Excavated between 1976 and 1979 in the Nihewan Basin of North China’s Hebei Province, the Xujiayao site yielded 20 cranial, mandibular, and dental fossils representing at least 16 individuals. Discovered alongside stone tools and animal remains, the bones date back to between 138,000 and 199,000 years ago.
When the fossils first emerged from the ground, scientists had no way of knowing who they belonged to. Their shape and age led early observers to debate whether they were Neanderthals or archaic Homo sapiens
. Because original DNA rarely survives millennia in these strata, researchers turned instead to palaeoproteomics—the study of ancient proteins that persist long after nucleic acids vanish.
Led by Qiaomei Fu and Xing Song at the Institute of Vertebrate Paleontology and Paleoanthropology of the Chinese Academy of Sciences, in collaboration with institutions including Nanjing Normal University and Peking University, the research team recovered 18 endogenous proteins from two of the Xujiayao remains. Their analysis revealed a critical amino acid substitution in the collagen gene COL1A2, designated COL1A2-996 R>K, featuring lysine at the 996 position. This exact molecular signature groups the specimens with known Denisovans with a statistical confidence above 99 percent.
We are finally starting to put a face to the Denisovan.
Sally Wasef, palaeogeneticist at the Queensland University of Technology in Brisbane, Australia, via ZME Science
Reconstructing the Heavy-Set Anatomy of the Denisovans
With the molecular identity of the Xujiayao specimens confirmed, the research team established the first morphology-based identification framework for the lineage. By comparing three-dimensional reconstructions of the Xujiayao and Harbin crania against roughly 200 comparative fossils from other human species, scientists mapped out a distinctive anatomical profile.
The resulting portrait depicts humans with thick cranial vaults, heavy-set features, and relatively low skull profiles. Their faces featured low, receding foreheads, prominent brow ridges, flat cheeks, and flat nasal bridges, accompanied by jaws that did not project sharply forward. Certain skeletal elements showed a complex mix of traits: a skull cap reminiscent of Homo erectus, inner ear structures resembling those of Neanderthals, and vaulted skull sides akin to modern humans.
Researchers emphasize that these traits did not appear simultaneously in every individual. Instead, the features manifested in flexible combinations across various specimens, reflecting a population that adapted to diverse ecological zones across Asia over hundreds of thousands of years.
Redrawing the East Asian Family Tree
This molecular anchoring of the Xujiayao fossils helps resolve long-standing debates over the classification of several other East Asian archaic Homo assemblages. Fossils from sites including Dali, Jinniushan, Hualongdong, and Xuchang, while lacking direct protein preservation, share enough anatomical traits to suggest they belong to the same broader lineage.
This unique combination of morphological traits, distinct from H. erectus, modern humans and Neanderthal-lineage hominins, supports the assignment of most members of East Asian late Middle Pleistocene archaic Homo as Denisovans.
Study authors, via Livescience
Fabrice Demeter, a palaeoanthropologist at the University of Copenhagen who was not involved in the work, noted that the study represents a major step forward in understanding human evolution in the region. He pointed out that a group spread across such a vast geographic range—from cold northern China down to subtropical environments—naturally developed variations in appearance.
While questions remain regarding how individual fossil groups relate to proposed designations like Homo juluensis, the new findings cement the Denisovans not as an isolated cave-dwelling rarity, but as the predominant archaic human population across East Asia from at least 300,000 until about 45,000 years ago.
