1505028 S1P sphingosine-1-phosphate 5214 1642715 SPP sphingosine-1-phosphate 116 2116491 Sph-1-P sphingosine 1-phosphate 69 3327476 S1P1 sphingosine-1-phosphate 1 27 1613959 SIP sphingosine-1-phosphate 11 1505033 S1-P sphingosine 1-phosphate 8 3460168 So1P sphingosine-1-phosphate 8 3460167 So-1-P sphingosine-1-phosphate 6 1631296 SP1 sphingosine 1-phosphate 2 1658766 SSP SPC, sphingosine 1-phosphate 2 1635230 SoP sphingosine phosphate 2