Registry of Toxic Effects of Chemical Substances Information about the database of toxicological information compiled, maintained, and updated by the National Institute for Occupational Safety and Health. http://www.cdc.gov/niosh/rtecs.html

Toxicology and Environmental Health Information Databases and resources related to toxicity, hazardous chemicals and ecological hazards, at National Library of Medicine, Bethesda, Maryland. http://www.sis.nlm.nih.gov/Tox/ToxMain.html

Toxicology sites Toxicology sites maintained by Dr. Hardin, at University of Iowa. http://www.lib.uiowa.edu/hardin/md/tox.html

Tetratox Database of toxic potency data for more than 2,100 industrial organic compounds maintained by the College of Veterinary Medicine, University of Tennessee, Knoxville. http://www.vet.utk.edu/TETRATOX/

Acute Toxicity Database Statistical approaches for taxonomic comparisons, and factors such as age, pH, temperature, water hardness, and diet affecting toxicological outcome. Maintained by the Columbia Environmental Research Center, Missouri. http://www.cerc.cr.usgs.gov/data/acute/acute.html

Distributed Structure-Searchable Toxicity Database Network DSSTox provides a community forum for publishing standard format, structure-annotated toxicity data files for open public access. Offers search based on chemical formula, maintained by the Environment Protection Agency, USA. http://www.epa.gov/nheerl/dsstox/

Fauna Laboratories, Ltd. Manufacturer of spider, scorpion, insect venoms and toxins since 1991, offers bulk sales, customized items, including arachnological expertise, arthropod collections for museums and education, from Almaty, Kazakhstan. http://www.faunalabs.com/