Mobile fractions and crystal hits for A2AAR/LUF5833. (a) Results of HT LCP-FRAP experiments. The following promising salts were selected for crystallization trials: (1) ammonium phosphate, (2) ammonium sulfate, (3) ammonium tartrate, (4) K citrate, (5) K phosphate, (6) Na malonate, (7) Na sulfate, (8) tacsimate. Crystal hits were observed from screens designed by combining Na citrate pH 6 buffer with the above eight salts and combinations of promising anions and cations at a wide range of concentration gradient. (b) Examples of crystal hits obtained in ammonium tartrate, tacsimate, K phosphate and Natartrate. Images were taken using crossed polarizers.