Homo- and hetero-dimerization of LPA/S1P receptors, OGR1 and GPR4 - Alexander Zaslavsky; Lisam Shanjukumar Singh; Haiyan Tan; Huawen Ding; Zicai Liang; Yan Xu (Biochimica et Biophysica Acta - Molecular and Cell Biology of Lipids, 2006)