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Three concentric circles. The innermost divided into four equal sectors: G, U, A and C. Outside this circle is a second circle, with sixteen sectors, divided four times into U, C, A and G, for each of the inner circle U, C, A and G respectively. The outermost circle indicates pairs, triplets or quartets of nucleotides: outside of the circles each pair or trio or quartet of nucleotides in the outermost circle is matched with the name of an amino-acid.

 5.1 Sickle cell anaemia