Principal component analyses. PC1 (Principal Component 1) separated the samples by the duration of cold-treatment; PC2 separated the samples by genotype and PC3 separated the samples by treatment (cold treated versus untreated). Symbols with the same shape and color represent biological replicates; the numbers on the axes of the graphs refers to the eigenvalues for each component.
Laudencia-Chingcuanco et al. BMC Genomics 2011 12:299 doi:10.1186/1471-2164-12-299