Fig. 3
From: The primordial tRNA acceptor stem code from theoretical minimal RNA ring clusters
Distance D3 of RNA rings to RNA ring 7 for cognate Asp as a function of the percentage of tRNAs with a primitive code in their acceptor stem [54] (averaged across kingdoms) with the same cognate as the RNA ring. Datapoints for cognates with tRNAs considered in [54] as belonging to those with an acceptor stem primitive code (A,D,G and V) are filled, others are empty circles. The trend line indicates that D3 decreases with the presence of a primitive code in tRNA acceptor stems (r = − 0.596, two tailed P = 0.00167)