Kotra R K, Shimoyama A, Ponnamperuma C, Hare P E
J Mol Evol. 1979 Oct;13(3):179-84. doi: 10.1007/BF01739477.
A carbonaceous chondrite from the Antarctic, referred to as the Allan Hills meteorite 77306, appears to be free from terrestrial organic contamination. The presence of both protein and non-protein amino acids and an equal abundance of D- and L-enantiomers of amino acids, is testimony to the extraterrestrial nature of these compounds.
