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Electron cryo-microscopy is a fast advancing biophysical technique to derive threedimensional structures of large protein complexes. Using this technique, many density maps have been generated at intermediate resolution such as 6-10Å resolution. Although it is challenging to derive the backbone of the protein directly from such density maps, secondary structure elements such as helices and β-sheets can be computationally detected. Our work in this paper provides an approach to enumerate thedoi:10.1142/s0219720011005604 pmid:21714133 fatcat:y4rzdxqcqbhzpcy42wes6n7umq