The document summarizes research analyzing amino acids extracted from the Murchison meteorite. Key findings include:
1) Individual amino acids from Murchison were enriched in the heavy nitrogen isotope 15N, confirming an extraterrestrial source for the previously observed excess of left-handed amino acid enantiomers in the meteorite.
2) The d15N values of most amino acids analyzed fell outside the range typically seen in terrestrial organic matter, further supporting an extraterrestrial origin.
3) Differences in d15N values between some amino acids suggest they may have had distinct precursor sources or undergone unique formation or decomposition processes.
4) Overall, the results provide strong evidence that the observed asymmetry in