and measure
their solubility as a function of pH, ionic strength, and salt type. Although the phase behavior of the three
proteins is quantitatively different, general trends emerge. Stable crystal nucleation does not occur within the
salting-in region for the proteins examined, despite the crystal being observed as the most stable solid phase.
Instead, two types of amorphous phases were found within the salting-in region; additionally, an analog to
the instantaneous clouding curve was observed within the salting-in region for chymosin B. Also, protein
solutions containing sulfate salts resulted in different crystal morphologies depending on whether Li2SO4 or
(NH4)2SO4 was used.