Rank of the most important metabolites. The rank was based on the cumulative contributions of the loadings of the first three PCs. Top 10 metabolites are given in white characters with a black background, the top 11 to 20 is given in white characters with dark gray background, the top 21 to 30 is given in black characters with a light gray background.
van den Berg et al. BMC Genomics 2006 7:142 doi:10.1186/1471-2164-7-142