Table 1. Lipid categories of the comprehensive classification system

Category	Abbreviation	Number	Common structures
Fatty acyls	FA	9918
Glycerolipids	GL	7656
Glycerophospholipids	GP	9957
Sphingolipids	SP	4854
Sterol lipids	ST	2985
Prenol lipids	PR	1485
Saccharolipids	SL	1326
Polyketides	PK	6863

The number in the LIPID MAPS database (Lipid structure, annotation, classification and pathways, analytical methods. http://www.lipidmaps.org.CC-BY).