From the 915 CID matches in PubChem, 784 (85%) include vendors submissions, indicating a high availability for purchase. However, this expands slightly since additional vendor matches internal to P&D may not be indexed in PubChem (note also the opnMe probes are free upon application). The 770 matches in ChEMBL indicate high levels of probe-target activity data extracted from papers. However, there is an unexpected shortfall of 115 probes without any active results in BioAssay.