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Asteroid Ryugu Contains All 5 DNA and RNA Building Blocks, Study Shows  GizmodoA complete set of canonical nucleobases in the carbonaceous asteroid (162173) Ryugu  NatureAsteroids and meteorites may have delivered the building blocks for life on Earth  Courthouse NewsRyugu asteroid sample contains all five key components of DNA, scientists find  SpaceAsteroid Reveals The 5 Key Genetic Ingredients For Life on Earth  ScienceAlert