Inconclusive evidence for nonterrestrial isoleucine enantiomeric excesses in primitive meteorites Elsila, Jamie E. ; Glavin, Daniel P. ; Dworkin, Jason P. ; Martins, Zita ; Bada, Jeffrey L. Abstract Publication: Proceedings of the National Academy of Science Pub Date: November 2012 DOI: 10.1073/pnas.1213261109 Bibcode: 2012PNAS..109E3288E