Googling I couldn't find anything more than a short definition of neurine :The yolk of the egg is highly acid-forming, and though it contains lecithin, the latter quickly decomposes to form choline and finally neurine, a nerve poison.
I found one study which involves neurine , and that's all about it on the internet. It's interesting how there's so little information, given that pretty much everyone eats eggs. Maybe it's not so toxic.Neurine is an alkaloid found in egg yolk, brain, bile and in cadavers. It is formed during putrefaction of biological tissues by the dehydration of choline. It is a poisonous, syrupy liquid with a fishy odor.
Neurine is a quaternary ammonium salt with three methyl groups and one vinyl group attached to the nitrogen atom. Synthetically, neurine can be prepared by the reaction of acetylene with trimethylamine. Neurine is unstable and decomposes readily to form trimethylamine.
I'm not sure whether this is relevant when eating raw egg yolks. I wouldn't stop eating them, but I wouldn't go and eat 20 per day, as e.g. this neurine might have some bad effects long term.
1. http://books.google.ca/books?id=6GLPJzr ... #v=onepage