Schema and Main functions within GDP. (a) The home page contains direct links to users' quick guide, the detailed search tool, bulk downloads and a quick search that interrogates all datasets for a single gene of interest. The detailed search tool enables individual genes, groups of genes or wild card searches (*). The bulk download option enables all differentially expressed genes for pairwise comparisons to be retrieved. (b) The gene results page provides both a tabular and graphical view of the expression levels for the searched genes in the different groups for each dataset selected. Access to gene information from external databases is provided (c) As multiple probe sets exist for many genes on the Affymetrix 430v2 array, the probe set page details the results for each probe for a chosen gene(s). (d) The normalized expression values for individual eyes in each group can be accessed.