The present invention relates to crystalline forms of the mono-sodium salt of D-isoglutamyl-D-tryptophan, pharmaceutical compositions comprising them, their use in the treatment of various diseases and conditions, and processes for their preparation. The main gear drives a pinion gear shaft rotatably carried on one end by the housing. The first member is disposed in proximity to the adjustment member and has at least one engagement member. The lumen is configured for delivery of fluid, and may be configured for slidably receiving a guidewire therein.