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Figure 1 | Biology Direct

Figure 1

From: The RNA world hypothesis: the worst theory of the early evolution of life (except for all the others)a

Figure 1

A proposal for the origin of tRNA through the ligation of a hairpin duplex catalyzed by an ancestral self-splicing group I-type intron based on proposals by Di Giulio [41], and Dick and Schamel [49]. In this depiction, the intron is shown as originating from a 3′ extension of one of the precursor hairpins formed by a transcriptional runoff error. aa indicates the amino acid binding site, but is not meant to imply that an amino acid was necessarily attached here during the intron ligation events.

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