Denis Headon of the Roslin Institute, in Edinburgh, and his colleagues, now think they know.

爱丁堡Roslin研究所的丹丹尼斯·赫顿(Denis Headon)和他的同事认为他们已经知道了。

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Denis Headon of the Roslin Institute, in Edinburgh, and his colleagues, now think they know.

爱丁堡Roslin研究所的丹丹尼斯·赫顿(Denis Headon)和他的同事认为他们已经知道了。

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