Fig. 1
From: The primordial tRNA acceptor stem code from theoretical minimal RNA ring clusters
Abundance of absolute values of Pearson correlation coefficients between distances among RNA ring sequences and hypotheses on amino acid integration order in the genetic code. The distribution of r is discontinuous between 0.66 and 0.71, with two r’s above 0.71 between distances to RNA ring 3 and i) the genetic code integration order derived from the GNN hypothesis (*, r = 0.72, two tailed P = 0.00007), and ii) the primitive tRNA stem code ($, r = 0.733, two tailed P = 0.00005)