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.


Tox21 Data Visualization - these tools are focused on providing quick, easy-to-use Tox21 qHTS data access, visualization, and clustering.

  • Tox21 Curve Browser – beta version: Visualize the concentration-response curves of one or many compounds of interest with the ability to superimpose assay results per compound for easy comparison.
  • Tox21 Activity Profiler – beta version: Prioritize compounds through compound structure and/or Tox21 qHTS data activity clustering visualization. Plots and data are available for download.

Tox21 Data Integration - these tools provide quick correlations between Tox21 compounds and biological and compound feature enrichment based on groupings of Tox21 chemicals by structure or biological activity.

  • Tox21 Enricher – beta version: Load a set of compounds and find any enriched toxicological characteristics in the set of uploaded compounds from many biological data sources such as DrugMatrix®, PubChem, Comparative Toxicogenomics Database, and Leadscope.

DrugMatrix® and ToxFX® - these tools increase the efficiency of the toxicological assessment process.

  • DrugMatrix®: Database contains one of the world’s largest toxicogenomic reference resources ever assembled.
  • ToxFX®: Companion database to Drug Matrix® and contains a reporting system that creates fully annotated reports in minutes.

External Tools

PubChem 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 – beta version: Access chemical quality control information. This tool was developed by the National Center for Advancing Translational Sciences (NCATS).

EPA hosts a collection of flat files for Tox21 and ToxCast programs as well as the EPA iCSS Dashboard. Files include assay and chemical descriptions, HTS data, and other related files.