Figure 4.

Statistical analysis of microarrays to identify developmentally relevant genes. A, Genes that are significantly enriched in one tissue (Spatial) or that change over time (Temporal) were identified by pairwise comparisons between all tissues and time points, compiled into a signature gene list, and categorized according to their spatiotemporal patterns of expression. B, A screen shot of the searchable online signature gene database. Expression data can be viewed in graphical or tabular (data not shown) format. The complete microarray database is also available in searchable form online (C).