Introduction Dysport® Injection Training Course Certification (abobotulinumtoxin A) | Video Instructions Dysport Certification Training (abobotulinumtoxin A) History of Botulinum Neurotoxin A In 1950, researchers at McGill discovered that botulinum toxin from the bacterial Clostridium botulinum presynaptically blocked the release of acetylcholine from motor nerve terminals. Effect...