Preliminary X-ray studies on two new crystal forms of staphylococcal enterotoxin C2

Two new crystral forms of staphylococcal enterotoxin C2 have been obtained by vapor-diffusion methods. Form 1 crystals are monoclinic in space group P2₁ with cell dimensions a = 43.43, b = 69.92, c = 42.22 Å, 8 = 90.1° and diffract to at least 2.7 Å resolution. Form 2 crystals are tetragonal in space group P4₁2₁2 or P4₃2₁2 with cell dimensions a = b = 42.98, c = 289.92 Å and diffract to 1.9 Å resolution.