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Figure 2.
HSE. Given the positions of 3 consecutive Cα atoms (A, B, C), the approximate side-chain direction 
b can be computed as the sum of 
and 
. The plane perpendicular to b cuts the sphere centered at B in an upper and a lower hemisphere.
b can be computed as the sum of and . The plane perpendicular to b cuts the sphere centered at B in an upper and a lower hemisphere.Paluszewski et al. Algorithms for Molecular Biology 2006 1:20 doi:10.1186/1748-7188-1-20
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