The cephalins are structurally identical with
the lecithins with the expection that the base enthanolamine instead of choline
is present. The cephalins are otherwise called as phosphatidyl ethanolamine.
The physical properties of the cephalins are
similar to those of lecithins. Cephalins are differentiated by the presence of
different fatty acid groups in the molecule. Lecithinase from snake venom
hydrolyses cephalins to lysocephalins which are similar to the formation of
lysolecithin from lecithin.