List Biological Laboratories, Inc. We have been producing high quality bacterial toxins for research since 1978. We have toxins available from over 26 different bacterial species. Toxins include C. difficile A and B, cholera, pertussis, diphtheria, tetanus, and shiga like toxins. We produce various subtypes of botulinum toxin as well as recombinant light chains from all serotypes of botulinum toxin. The company enjoys receiving customers’ ideas for new products. We routinely support contract manufacturing requests for various bacterial reagents, highly characterized reagents, and cGMP compliant material for early phase clinical trials.