This "Search by target" is an experimental feature that enables you to search the dependency database by target gene (rather than by driver gene). As the database currently contains 105 driver genes these "Search by Target" dependency results will therefore be limited to these 105 driver genes.
If you click the "" arrow beside the 'Target/Dependency gene' input box below, then there may be a delay of several seconds before the menu displays, as there are about 19 thousand target genes in the menu.

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