Phospholipid species discussed in this review and shown in crystal structures complexed to phospholipid binding proteins. Sfh1 has been crystallized bound to phosphatidylinositol (PI), phosphatidylethanolamine (PE), and phophatidylcholine (PC). SF-1 has been crystallized bound to several lipids including phosphatidylinositol(4,5)bisphosphate (PIP2) and phosphatidylinositol(3,4,5)trisphosphate. LRH-1 has been crystallized bound to several lipids including PIP3 and dilaurylphosphatidylcholine (DLPC). PPARϒ has been crystallized bound to several lipids including 9-hydroxyoctadecadienoic Acid (9-HODE).