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We report here on crystallization and preliminary X-ray analysis of plant class I chitinase from rice (OsChia1b). Similar single crystals of full-length OsChia1b were obtained under two independent conditions. The crystals grown under these conditions diffracted up to 2.1 and 2.5 Å resolution, respectively, at a synchrotron beamline, and were found to belong to the tetragonal space group P43212.