"The amino acid glycine, a fundamental building block of proteins, has been found in a comet for the first time, bolstering the theory that raw ingredients of life arrived on Earth from outer space, scientists said on Monday."
http://www.reuters.com/article/scienceNews/idUSTRE57H02I20090818
http://www.reuters.com/article/scienceNews/idUSTRE57H02I20090818