There have now been two separate reports of analyses of samples recovered from two different asteroids.
Here is the link to the most recent publication in Nature: https://www.smithsonianmag.com/smart-news/building-blocks-of-life-found-on-samples-collected-from-an-asteroid-180980231/
And here is the link to the publication in The Smithsonian in 2002:
In both instances, samples collected from totally unrelated asteroids showed the presence of amino acids, the building blocks of proteins that are central to life.
In the latest report, all 20 of the amino acids as well as all 4 nucleotide bases that comprise RNA and DNA were found on that rock.
Both asteroids date from near the beginning of the creation of the universe.
The implications of these two distinct and separate findings could mean that life on earth began after asteroids bearing those protein and RNA/DNA components smashed into this planet. They could also mean that other planets in the universe have life as we know it, because asteroids crashed into them, or because the asteroids we have assayed came from destruction of those other planets.
Either way, this is astonishingly compelling evidence that there is life elsewhere and that, once again, the geocentric views that we hold about our special home planet are wrong. There is nothing that innately separates the Earth from other planets, our solar system from other solar systems, the Milky Way galaxy from other galaxies, or even our universe from other universes. We need to internalize this concept so that we understand that preserving and protecting our home planet is our responsibility, not that her existence is assured no matter what we do.