Temperature-composition phase diagrams for (A) 7.7 MAG and (B) 9.9 MAG, two monoacylglycerols that have proven to be particularly useful hosting lipids for the in meso crystallization of membrane proteins, complexes and peptides (Table 1). Cartoon representations of the different solid (Lc), liquid (FI) and liquid crystalline phases (Lα, HII, cubic-Pn3m, cubic-Ia3d) accessed in the temperature and composition range studied are shown along the top of the figure. The phase diagrams were constructed based on small-angle X-ray scattering measurements.48,133