Additional file 2.The screeplot of the principal component analysis. The screeplot of principal component analysis, where the x-axis gives the index of each principal components, and the y-axis gives the proportion of variance. Format: PDF Size: 82KB Download file This file can be viewed with: Adobe Acrobat Reader Zhang and Zhang BMC Bioinformatics 2011 12:155 doi:10.1186/1471-2105-12-155 |