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Human Dicer protein contains two RNase III domains (RNase IIIa and RNase IIIb) which are involved in the production of short interfering RNAs (siRNAs). The C-terminal RNase III domain (RNase IIIb) of human Dicer was expressed, purified and crystallized by the sitting-drop vapour-diffusion method. The crystals belonged to space group C2221, with unit-cell parameters a = 88.6, b = 199.7, c = 119.6 Å, and diffracted X-rays to 2.0 Å resolution. The asymmetric unit contained three molecules of the RNase IIIb and the solvent content was 67%.

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