Uhlenbrock K, Gassenhuber H, Kostenis E (November 2002). "Sphingosine 1-phosphate is a ligand of the human gpr3, gpr6 and gpr12 family of constitutively active G protein-coupled receptors". Cellular Signalling. 14 (11): 941–953. doi:10.1016/S0898-6568(02)00041-4. PMID12220620.
Uhlenbrock K, Gassenhuber H, Kostenis E (November 2002). "Sphingosine 1-phosphate is a ligand of the human gpr3, gpr6 and gpr12 family of constitutively active G protein-coupled receptors". Cellular Signalling. 14 (11): 941–953. doi:10.1016/S0898-6568(02)00041-4. PMID12220620.