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The hatching enzyme of the zebrafish, ZHE1 (29.3 kDa), is a zinc metallo­protease that catalyzes digestion of the egg envelope (chorion). ZHE1 was heterologously expressed in Escherichia coli, purified and crystallized by the hanging-drop vapour-diffusion method using PEG 3350 as the precipitant. Two diffraction data sets with resolution ranges 50.0-1.80 and 50.0-1.14 Å were independently collected from two crystals and were merged to give a highly complete data set over the full resolution range 50.0-1.14 Å. The space group was assigned as primitive orthorhombic P212121, with unit-cell parameters a = 32.9, b = 62.5, c = 87.4 Å. The crystal contained one ZHE1 molecule in the asymmetric unit.

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