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.

Gorodkin et al. Genome Biology 2007 8:R45   doi:10.1186/gb-2007-8-4-r45
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