Until April 2014 this article was a stub split from Neuromuscular junction . Someone, possibly a student, copied in a partially completed paper on the subject. Unfortunately only the names of the references were given. The full references were never copied in. To remove the ugly red reference errors these produce I am replacing things like <ref name=twentyone /> with (reference 21). I hope someone will use clues in the material to track down these missing references. StarryGrandma (talk) 05:06, 5 April 2016 (UTC)[reply]
