Figure 4.

Patterns of differential expression. Differential expression within brain and spinal cord tissues. The clusterings were made using the package of de Hoon and coworkers [43], with options 'uncentered correlation' and 'average-linkage'. Gray fields indicate that the number of reads did not exceed the read cutoff of four reads for a given contig in a given library. However, such numbers were still counted as having the value zero when centering the expression values for the gene cluster. The tree has arbitrary scale.