The lecithin to sphingomyelin ratio of 2:1 or greater is characteristic of mature fetal lungs. Fetuses delivered prior to this gestational age are at increased risk of neonatal respiratory distress syndrome.

No

Sphingomyelin

The amino alcohol found in sphingomyelin is called sphingosine. It is a component of the sphingolipid family and plays a key role in the formation of cell membranes.

An actinoporin is a type of actinotoxin which forms pores in membranes which contain sphingomyelin.