This is a representation of figure 2 from T. Hla, et al. 2001, Science, 294, pg. 1877.
Sphingosine-1-phosphate (S1P) is a signaling sphingolipid, also known as lysosphingolipid. It is also referred to as a bioactive lipid mediator. Sphingolipids at large form a class of lipids characterized by a particular aliphatic aminoalcohol, which is sphingosine.sphingosine 1-phosphate signaling pathwayPW:0000960Pathway Ontology