Coupled with the principal component analysis, such a result reinforces the course clustering according to its field of knowledge.
Without the regulatory signatures, solely time course clustering of such a large number of genes produced noisy clusters (data not shown).
In the current study, we focused our analysis on the response of these genes over time, and applied a novel time course clustering technique to identify genes with potential regulatory similarities.
The z-standardized signal time courses of all voxels are simultaneously considered, compared, and assigned to representative cluster time courses (cluster centroids).
First, several known regulators of larval development in sea urchins (e.g., chordin, hes, even-skipped, lefty, foxY) declined throughout our time-course (Cluster 1, supplementary fig. S1, Supplementary Material online).
You can run into a famous someone just about anywhere on courses clustered around this seaside town, which has traces of the royal, vestiges of the ancient and just enough of the modern.
It does not have any general education requirements; students choose a major out of three divisions available and enroll in thematic three-course clusters in the two remaining areas.
Similarly, students in FOCUS, a first-year program that features courses clustered around a specific theme, live together in the same residence hall as other students in their cluster.
For time-course clustering analysis, the gene expression values were standardized to have a mean value of zero and a standard deviation of one for each gene profile.
Time-course clustering was performed using the 2,053 genes detectibly expressed at all four stages in the hybrids and their two parental species using the 'Mfuzz' package in Bioconductor [ 26].
Our first enrichment analysis (see Clustering and time-series analysis results above) was done for each of the time-course clusters using the complete GO annotation, and only 2 clusters (those with profiles 41/42 and with profiles 4/0) had functions significantly overrepresented on them and are therefore shown in detail in Table 2.
