From NuGOwiki

The phospholipid Phosphatidylcholine (once given the trivial name 'lecithin') is the chemical combination of glycerol, two fatty acids and phosphocholine. Phosphatidylcholine is usually the most abundant phospholipid in animal and plants, often amounting to almost 50% of the total, and is the key building block of membrane bilayers. In particular, it makes up a very high proportion of the outer leaflet of the plasma membrane. Phosphatidylcholine is also the principal phospholipid circulating in plasma, where it is an integral component of the lipoproteins, especially the HDL. Find more on phosphatidylcholines on the Lipid library link.

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