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(a) Results for HTH-type protein 2ISZ as target after a four-fragment search (with HTH models) via Phaser at 2.4 Å and (b) HTH motif 3RKQ after search for two fragments. For both target structures no solution was found. The model with the missing entry for the CC bar in (a) (3cta) did not pass the packing in Phaser.
