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232 Arnau et al.<br />

Fig. 1. Overview of histidine tag (His-tag) tumor necrosis factor (TNF) (A) and<br />

TAGZyme process for His-tag removal (B). The N-terminal sequence of the His-tag<br />

TNF protein contains an even number of residues (the UZ-HT15 His-tag: MK HQ<br />

HQ HQ HQ HQ HQ) that are cleaved by the DAPase before a Q residue adjacent to the<br />

native start of TNF. DAPase cleavage is performed in the presence of excess Qcyclase

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