Genetic building blocks may have formed in space - space - 13 June 2008 - New Scientist Space:

The find might bolster claims that meteorites delivered some of the chemicals needed to create life. "It boosts the idea that the origin of life on Earth may have had an important contribution from an extraterrestrial object," says lead author Zita Martins, a chemist at Imperial College London in the UK.

But it may be too early to conclude these nucleobases formed beyond the Earth, says Sandra Pizzarello, a chemist at Arizona State University in Tempe, US. The study "raises a very interesting question that was raised a very long time ago, but I don't think it solves it", she told New Scientist.