Crystals of recombinant human interleukin 10 have been grown from solu
tions of ammonium sulfate. The crystals are tetragonal, space group P4
(1)2(1)2 or P4(3)2(1)2; the unit cell axes are a = 36.5 Angstrom and c
= 221.9 Angstrom. There is the equivalent of one polypeptide chain in
the asymmetric unit, The crystals are stable to X-rays and diffract t
o at least 2.5 Angstrom resolution. (C) 1995 Wiley-Liss, Inc.