Ancient Proteins Show What Denisovans Looked Like
Scientists in China used protein analysis on ancient bones to identify Denisovan fossils, revealing new details about their appearance and spread.
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Scientists in China say they now have a clearer picture of the Denisovans, a group of ancient humans. The team, led by the geneticist Qiaomei Fu, studied about 20 fossils from a site called Xujiayao in the north of the country. The bones were found in the 1970s and are more than 130,000 years old. For many years, researchers were not sure which type of human they belonged to, and some called them a separate species named Homo juluensis.
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The were found in the 1970s and are more than 130,000 years old.
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To solve the puzzle, the team tested tiny pieces of protein from two of the bones. Proteins last longer than DNA, so they can still be read in very old fossils. The scientists found one small change in the protein collagen that appears in Denisovans but not in modern humans or Neanderthals. This marked the Xujiayao people as Denisovans. Together with a skull from the city of Harbin, identified last year, the fossils show a heavy face with a low, sloping forehead, thick brow ridges and flat cheeks. The skull cap is wide and thick, while the sides of the skull are tall, like ours.
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The found one small change in the protein collagen that appears in Denisovans but not in modern humans or Neanderthals.
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Other experts call the study a big step, and they say it suggests that Denisovans lived across a wide area and may have been quite varied. Still, many questions remain. Only two of the twenty fossils were tested, and no DNA was found, so the link between all the bones is not certain. Some scientists also argue that proteins alone are not enough to prove who a fossil belongs to. New finds and better lab methods may change the picture again.
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Other experts call the study a big step, and they say it suggests that Denisovans live across a wide area and may have been quite varied.
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Topics Science
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- OpinionWhy do you think people are so interested in early humans and their relatives?
- OpinionIs it a good idea to spend money on studying very old bones? Why or why not?
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# Speaking practice: Ancient humans and how we learn about them
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Topic: Ancient humans and how we learn about them. It comes from a short text called “Ancient Proteins Show What Denisovans Looked Like”.
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1. Why do you think people are so interested in early humans and their relatives?
2. Is it a good idea to spend money on studying very old bones? Why or why not?
3. Have you ever visited a museum or a historical site that made you think about the past? What was it like?
4. Tell me about a time when you learned something that changed what you believed before.
5. What if scientists could bring back one extinct human group? Would it be a good idea?
6. If you could travel back 130,000 years for one day, what would you take with you?
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- protein (B2)
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- cheek (B1)
- species (B2)
- researcher (B1)
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The were found in the 1970s and are more than 130,000 years old.
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For years, researchers were not sure which type of human they belonged to, and some called them a separate species named Homo juluensis.
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Scientists in China they now have a clearer picture of the Denisovans, a group of ancient humans.
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The found one small change in the protein collagen that appears in Denisovans but not in modern humans or Neanderthals.
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One word is in the wrong form: “mark”. Type the correct form of that word.
This mark the Xujiayao people as Denisovans.
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Proteins longer than DNA, so they can still be read in very old fossils.
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Type the answer
One word is in the wrong form: “live”. Type the correct form of that word.
Other experts call the study a big step, and they say it suggests that Denisovans live across a wide area and may have been quite varied.
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