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DNA’s Building Blocks May Have Arrived from Space, Asteroid Ryugu Samples Suggest

Samples returned by JAXA’s Hayabusa-2 mission from the C-type asteroid (162173) Ryugu contain all five canonical nucleobases -- purines (adenine and guanine) and pyrimidines (cytosine, thymine and uracil) -- pointing to a cosmic origin for some of life’s fundamental chemistry.

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