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Model for the CD40 fragment displayed in the electron density map. The 3.5-Å 2Fo − Fc map was contoured at 0.75σ and is displayed in stereo. For modeling, the peptide was fitted to Fo − Fc difference maps and omitmaps (36). Clear electron density was visible for the backbone to position the bound peptide; however, density was weak for some side chains. The reverse turn configuration was clearly defined.
