Protease footprinting delineates the chaperone-binding sequence of SptP. Electron density from a map calculated with MAD solvent-flattened phases to 2.2 resolution and contoured at 1.0 . Residues from the final, refined models of SptP and SicP are shown with atoms of oxygen, nitrogen and carbon in red, blue and yellow, respectively. Some amino-acid side chains around W52 of SptP are labelled in green (SicP) or red (SptP).

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