The database has 98685 K_i values for searching, and is growing. This list shows the Top 100 Receptors/Targets in K_i Please let us know if you feel we should add any papers or data. We welcome all feedback/suggestions/comments. Other features on K_i DB are: Download K_i, Data Mining, CDD Interface allows mining K_i database by structure, substructure or structure similarity. Anatomical profiling of GPCR expression is offered for selected targets.