Figure 1
From: Integrating gene expression and GO classification for PCA by preclustering
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1471-2105-11-158/MediaObjects/12859_2009_Article_3615_Fig1_HTML.jpg)
Example of heterogeneous expression profiles within a single GO class. Expression profiles for genes annotated with the term GO:0007047 are depicted here for the cdc15 synchronization of the Saccharomyces cerevisiae Cell Cycle dataset [12]. From the first subpicture, containing all profiles simultaneously (A), it is clear that there is big variation within the profiles. More homogeneous subgroups, with shifted or even anti-correlated profiles in time, can be identified (B, C, D).