Color scheme. Left: Venn diagram grouping of amino acids based on the biochemical properties: hydrophobicity, size and polarity. Colors for the intersection groups are derived by additive blending of the colors of respective properties. Right, top: Alternative color schemes for amino acids (note that the scheme labeled ClustalW is based on the default coloring without color parameter file with N, D, Q, E, A and C mapped to purple.) Right, bottom: Alternative color schemes for nucleic acids.