Fig. 2

bioSyntax nucleotide colour scheme. a The four primary bases are coloured in two pairs of contrasting colours. IUPAC ambiguous bases are then coloured in increasingly lighter tones of the approximately mixed colours. To accomodate 4-dimensional bases in 3-dimensional colours, aMino (A or C) and Keto (G or T) bases are darker. b A comparison of nucleotide colour-schemes in the literature. c bioSyntax colouring allows for approximation of a sequences GC-content by how warm (high GC) or cool (high AT) it appears