qHTS data



Allows access to large-scale screening data (including but not limited to Tox21 qHTS data), along with the medicinal chemistry and informatics necessary to identify chemical probes to study the functions of genes, cells, and biochemical pathways. PubChem is organized as three linked databases within the NCBI’s Entrez information retrieval system. These databases are PubChem Substance, PubChem Compound, and PubChem BioAssay.


Tox21 Data Browser

Visualization of Tox21 qHTS data including concentration-response curves, curve fitting results and different activity metrics along with chemical structure and analytical QC results. Data are searchable by assay and/or chemical. Results from multiple assays and/or chemicals can be overlaid for ease of comparison. All data as well as assay descriptions and detailed screening protocols are available for download.


Toxicity ForeCaster (ToxCast™) Data

A collection of flat files for Tox21 and ToxCast programs. Files include assay and chemical descriptions, HTS data, and other related files.





Browse pathways by source, species, biological function/process, disease/toxicity relevance and availability of probing assays. Pathway enrichment analysis of gene sets. This integrated platform will facilitate systematic analysis and modeling of toxicity responses.


EPA CompTox Chemicals Dashboard

The EPA Computational Toxicology (CompTox) Chemicals Dashboard, formerly the Chemistry Dashboard, helps decision-makers and scientists quickly and efficiently evaluate thousands of chemicals. The Dashboard is a one-stop-shop for chemistry, toxicity and exposure information for over 760,000 chemicals. Data and models within the Dashboard also help with efforts to identify chemicals of most need of further testing and reducing the use of animals in chemical testing. The CompTox Chemicals Dashboard integrates data from various sources including:

  • ToxCast and Tox21 – High-throughput chemical screening data
  • ExpoCast – Chemical exposure data and prediction models
  • DSSTox – High quality chemical structures and annotations
  • PhysChemDB – Physical Chemical Properties Database
  • CPCat – Chemicals listed by associated categories of chemical and product use


Tox21 Toolbox 

The Tox21 toolbox contains useful tools for accessing and visualizing the Tox21 quantitative high throughput screening (qHTS) 10K library data, as well as integrating with other publicly available data.



NCATS Publications

EPA Publications

FDA Publications