Figure 1. Venn diagram of the number of distinct compounds across ChEMBL (version 24), classified by the biological complexity of the assay system.

The assays have been grouped using the assay_type: B (binding) which represents interaction of compounds with molecular targets; F (functional) in vivo (defined by BAO_0000218 - organism-based format) and non in vivo functional assays (ie those in cell-, tissue- or organ-based systems), and the number of distinct compounds in each assay group were counted regardless of their activity (or inactivity), biological target or units of measurement.