“…Egg yolk appears to be free from cerebroside and nearly free from phosphatidylserine; there have been no reports on its sulphatide content, if any. Liver seems to be the only animal tissue that is virtually free from cerebroside (Williams et al 1945), although it does contain phosphatidylserine and there is some evidence for the presence of sulphatide (Green & Robinson, 1960).…”