Microscopic images of the LCP crystallization attempts.

A) S1P₁, precipitant: 0.2 M CaCl₂, 0.1 M HEPES pH 7.5, 30% (w/v) PEG 4000. B) S1P₁, precipitant: 1 M (NH₄)₂SO₄, 0.1 M HEPES pH 7.0 and 0.5% (w/v) PEG 8000. C) GPR3, precipitant: 0.1 M BIS-TRIS pH 5.5 and 2 M (NH₄)₂SO₄ as crystallization condition. D) GPR3, precipitant: 0.1 M 2-(N-morpholino)ethanesulfonic acid (MES) pH 6.5 and 0.6 M Zn(CH₃COO)₂ as crystallization condition.