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A 10.5 kDa non-Pfam hypothetical protein, AF1514, from the hyperthermophilic archaeon Archeoglobus fulgidus has been overexpressed in Escherichia coli, purified and crystallized using the hanging-drop vapour-diffusion method. The crystals diffracted X-rays to 2.09 Å resolution and a data set was collected at 100 K using Cu K radiation from a rotating-anode X-ray source. The crystals belong to space group P4 1 2 1 2 or P4 3 2 1 2, with unit-cell parameters a = b = 49.27, c = 106.61 Å . The calculated Matthews coefficient was 3.16 Å 3 Da À1, suggesting the presence of one molecule in the asymmetric unit.