available for the origin of life on Earth (Poole et al., 1998). The slow part of the process is sent back to the origin of replication and of the tRNAs. The simplicity and the highly deterministic character of the process suggest that the Last Universal Common Ancestor populations could, at some early stages, be composed of lineages bearing similar genetic codes. Simulations of the probabilities of the different codes inside these populations are being conducted (Farias et al., in preparation).
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