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From the following article:

Amino acids from ultraviolet irradiation of interstellar ice analogues

G. M. Muñoz Caro, U. J. Meierhenrich, W. A. Schutte, B. Barbier, A. Arcones Segovia, H. Rosenbauer, W. H.-P. Thiemann, A. Brack and J. M. Greenberg

Nature 416, 403-406(28 March 2002)

doi:10.1038/416403a