The Fv fragment of mouse myeloma protein M313 was crystallized from poly(ethylene glycol) solution in the form of monoclinic crystals, space group C2 and unit cell dimensions a = 5.96 nm (59.6 A), b = 5.66 nm (56.6 A), c = 13.79 nm (13.9 A) and beta = 99.7 degrees. Some unusual effects of poly(ethylene glycol)on protein crystals were noted and are discussed.
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