MapMan overview of cellular metabolism (A) and regulation (B) showing SNP-harboring genes and SNP frequencies. Individual genes are represented by small squares. The SNP frequency for each gene is indicated by the intensity of the blue color on a 0 to 3 scale. Dark blue (scale intensity 3) indicates genes with three or more SNPs. A complete list of SNP-harboring genes, corresponding MapMan functional categories and SNP frequencies are provided in Additional file 5.