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Ancient proteins give a clearer picture of the Denisovan face

Scientists used ancient proteins from Chinese fossils to link Denisovans to a distinct skull shape, suggesting they lived across a wider area.

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Scientists in China say they now have a clearer idea of what Denisovans looked like. The study appeared in the journal Nature on October 21. The team looked at 20 fossils from a site called Xujiayao in northern China. The bones are between 138,000 and 199,000 years old, and for years experts argued about which kind of early human they belonged to.

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Scientists in China they now have a clearer idea of what Denisovans looked like.

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The old bones had no usable DNA, so the researchers studied proteins instead. They found 18 ancient proteins in two of the fossils. One of them carried a small change that had only been seen in known Denisovans, not in Neanderthals or modern people. That tied the fossils to the Denisovans. The team then compared the skull pieces with other fossils from East Asia, including a nearly complete skull from the city of Harbin. They describe a low, wide skull with thick bone, a heavy brow ridge, flat cheeks and a face that did not stick out much.

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The   then compared the skull pieces with other fossils from East Asia, including a nearly complete skull from the city of Harbin.

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The picture is not a portrait of one person. The Xujiayao bones do not include complete face bones, so the face is built from patterns seen in several fossils. Experts say more samples are needed to test it. Denisovans were first known from DNA in a finger bone found in a Siberian cave in 2010. If the new study is right, some fossils from across East Asia may belong to the same group, which would mean Denisovans lived over a much wider area than people thought.

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Питання агента

  1. Why did scientists study proteins instead of DNA in these old bones? Чому вчені досліджували білки, а не ДНК, у цих старих кістках?
  2. What did the scientists say the Denisovan skull and face looked like? Якими, за словами вчених, були череп і обличчя денисовця?
  3. Do you find stories about ancient humans interesting? Why or why not? Чи цікаві тобі історії про давніх людей? Чому так чи ні?
  4. Have you ever visited a museum with old bones or fossils? Чи відвідував ти колись музей зі старими кістками чи скам'янілостями?
  5. If scientists found more fossils tomorrow, what new question would you want them to answer? Якби вчені завтра знайшли більше скам'янілостей, яке нове питання ти б хотів, щоб вони з'ясували?

Питання до агента

  • Do you know anything else about Denisovans or Neanderthals? Чи знаєш ти ще щось про денисовців чи неандертальців?
  • Why do you think DNA disappears from very old bones? Як ти думаєш, чому ДНК зникає зі старих кісток?
  • Would you like to work as a scientist studying ancient fossils? Чи хотів би ти працювати вченим, що вивчає давні скам'янілості?

Нема що сказати? Почніть так

  • I think that... Я думаю, що...
  • From what I remember, the article said... Наскільки я пам'ятаю, у статті сказано...
  • In my opinion... На мою думку...
  • I'm not sure, but maybe... Я не впевнений, але можливо...
  • Honestly, I've never thought about... Чесно кажучи, я ніколи не думав про...

Слова з тексту

  • bone кістка a hard part inside a body The dog buried a bone in the garden.
  • expert експерт a person who knows a lot about something She is an expert in computer programming.
  • protein білок a small substance found in the body and food Eggs and meat contain a lot of protein.
  • belong належати to be a member or part of a group This book belongs to my sister.
  • ancient стародавній very old, from a long time ago We visited an ancient castle last summer.
  • describe описувати to say what something is like Can you describe your favorite movie to me?
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# Speaking practice: Ancient proteins give a clearer picture of the Denisovan face

You are my friendly English conversation partner. We talk by voice, so keep every reply short: one to three sentences. Speak English only.

About me: I am an intermediate learner (CEFR B1-B2): I can talk about experiences and opinions, with some mistakes. My native language is Ukrainian.

The text we talk about is called “Ancient proteins give a clearer picture of the Denisovan face”. Scientists in China studied ancient fossils from a site called Xujiayao because nobody was sure what kind of early human they were. Since the bones had no DNA, researchers looked at ancient proteins instead and found a link to the Denisovans. This helped them describe a Denisovan face and skull shape for the first time, suggesting Denisovans lived across a much wider area than scientists thought.

The conversation has three stages:

- 1. The text: start with the first questions, which are about what the text says.
- 2. Me: move on to the later questions, which are about my own experience and opinion.
- 3. The end: when I say we are done, or after the last question, stop asking and give the report below.

Ask me these questions in this order, one at a time. Wait for my answer and react to it in a few words before the next one.

1. Why did scientists study proteins instead of DNA in these old bones?
2. What did the scientists say the Denisovan skull and face looked like?
3. Do you find stories about ancient humans interesting? Why or why not?
4. Have you ever visited a museum with old bones or fossils?
5. If scientists found more fossils tomorrow, what new question would you want them to answer?

If I get stuck, give me one of these sentence starters or make the question easier:

- I think that...
- From what I remember, the article said...
- In my opinion...
- I'm not sure, but maybe...
- Honestly, I've never thought about...

Target words. Use them naturally in your own replies and ask questions that make me want to use them:

- bone: a hard part inside a body Example: The dog buried a bone in the garden.
- expert: a person who knows a lot about something Example: She is an expert in computer programming.
- protein: a small substance found in the body and food Example: Eggs and meat contain a lot of protein.
- belong: to be a member or part of a group Example: This book belongs to my sister.
- ancient: very old, from a long time ago Example: We visited an ancient castle last summer.
- describe: to say what something is like Example: Can you describe your favorite movie to me?

If I ask what a word means, answer in simple English with a short example. Say the word in my native language only if I ask a second time.

If I go off the topic, answer in one sentence, then bring me back to the question we were on.

Rules:

- Do not correct me while I speak. Let me finish my thought.
- Quietly keep a list of my mistakes and of the new words I used or needed.
- Report: my mistakes with the corrected sentences, which target words I used and which I did not (with a short meaning of each one I did not), and one thing to practise next.

Start now with the first question.

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