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shapeanddimension.(a)tropomyosin,a70-kdamuscle protein, is a two-stranded a-helical coiled coil. estimate the length of the molecule. (b) suppose that a 40-residue seg- ment of a protein folds into a two-stranded antiparallel b structure with a 4-residue hairpin turn. what is the longest dimension of this motif?