• To select a source-entity: double-click on it; its color will change from blue to orange.
  Consequently, this source-entity will be the only one to be consulted for a given entity.
  Note: If you select a source-entity then the related entity will be automatically selected in the graph of entities.
   
• You can also exclude a source-entity, which means that this source will not be used to find instances of this entity.
  To exclude a source-entity, use the popup-menu (right click) and click on the item Exclude/Include.
  Note: It does not make sense to select a source-entity and to exclude another source for the same entity. Thus any exclusion will remove the selections and vice versa.

Here PIR_Protein has been selected