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Dipolar restoration at the magic angle (DRAMA) has been used to measure the 31 P- 31 P internuclear distance between phosphine-sulfide substituted sidechains on the fourth and eighth residues of a 12-residue helical peptide. The 7.4 9 distance is the same for the peptide lyophilized in bulk or isolated in a cryo- and lyoprotected matrix of poly(ethylene glycol) and sucrose...
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