Table 1: A comparison of genomic search engine features.

ArrayExpressOncomineplexDBGenevestigatorArraySearch

1 Websitehttp://www.ebi.ac.uk/gxa/http://oncomine.org/http://www.plexdb.org/https://www.genevestigator.com/http://ArraySearch.org/
2 Microarray data sourceArrayExpressArrayExpress, GEO, SMDAtGenExpress, NASCArrays, TAIR, datasets uploaded by plexDB curatorsAtGenExpress, NCBI GEO, TAIR, ArrayExpress, NASCArrays, other sources …NCBI GEO
3 SpeciesArabidopsis+othersHumanArabidopsis+othersArabidopsis+othersArabidopsis
4 statistical analysis
4.1 Query gene correlation with contrastsNoNoNoNoYes
4.2 Query gene correlation by gene ontologyNoNoNoNoYes
4.4 User-defined expression profile queryNoNoNoNoYes
4.5 Correlation between query gene/samplesNoNoNoNoYes
5 Graphical output of gene coexpressionHeatmapScatter plotLine graph/hierarchical ClusteringLine GraphHeatmap/bargraph
6 Output: coexpression scores between query genesNoNoYesYesNo
7 ReferencesParkinson et al. [10]Rhodes et al. [5]Wise et al. [4]Hruz et al. [2]