Public Domain hERG Bioactivity Data. ChEMBL has been a major repository in the public domain for compound activity data extracted from scientific literature. The most recently updated ChEMBL database (version 25, accessed 28 October, 2019) provides more than 20000 activity records for hERG channel (UniProt accession: Q12809). The activity records were preprocessed, as previously described in literature, to generate a high-confidence bioactivity dataset. Briefly, only the potency and affinity values reported as IC50, EC50