Figure 6From: Fast and accurate protein substructure searching with simulated annealing and GPUsDouble-quadrant encoding of orientations. The relative orientation of any two SSEs is encoded as a two-character string with the two quadrant schemes shown, which differ in orientation by 45° in order to prevent small variations resulting in completely different encodings. The first quadrant encoding is labelled P, O, L, R for parallel, anti-parallel, crossing-left, and crossing-right, respectively, and the second arbitrarily E, D, S, T[18]. For example, two SSEs that are anti-parallel would be encoded as either OS or OT.Back to article page