International Journal of Astrobiology / FirstView Article / October 2012, pp 1- 5
DOI: 10.1017/S1473550412000468, Published online.
International Journal of Astrobiology 12 (1): 94–98 (2013)
It has been argued that the limited set of proteins used by life as we know could not have arisen by the process of Darwinian selection from all possible proteins. This probabilistic argument has a number of implicit assumptions that may not be warranted. A variety of considerations are presented to show that the number of amino acid sequences that need to have been sampled during the evolution of proteins is far smaller than assumed by the argument.
How to cite this article:
Gerald E. Marsh The problem of the ‘prebiotic and never born proteins’. International Journal of Astrobiology, Available on