Botulinum toxin
In 1895 (seventy-five years later), Émile van Ermengem, professor of bacteriology and a student of Robert Koch, correctly described "Clostridium botulinum" as the bacterial source of the toxin. Thirty-four attendees at a funeral were poisoned by eating partially salted ham, an extract of which was found to cause botulism-like paralysis in laboratory animals. Van Ermengem isolated and grew the bacterium, and described its toxin, which was later purified by P Tessmer Snipe and Hermann Sommer.
Butantoxin
Butantoxin is one of multiple toxins isolated from the venom of three Brazilian and one Argentinean scorpion species of the genus "Tityus": "T. serrulatus", "T. bahiensis", "T. stigmurus" and "T. trivitattus". Butantoxin was the first isolated scorpion toxin (identical primary structure and folding) found to be produced by more than one scorpion species. Previously studied toxin sequences varied between different species within a genus.