Gene 1100001A16Rik LPb2 Gpcr13 sphingosine-1-phosphate receptor 2 Edg5 - H218 S1P2 MGI:99569 O Gpcr13|1100001A16Rik|Edg5|H218|S1P2|LPb2 protein coding gene http://identifiers.org/mgd/MGI:99569 S1pr2 genetic mapping