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Table 7 Extension threshold for proteins of 4 classes

From: Improved Chou-Fasman method for protein secondary structure prediction

Protein Class helix extension threshold strand extension threshold
All alpha 0.98 No statistic
All beta No statistic 1.01
Alpha and beta (α/β) 1 1.02
Alpha or beta (α+β) 0.99 0.98
  1. Notice that the strand extension threshold in all alpha class and the helix extension threshold in all beta class are not statistical in reference 20.