The SSP is an algorithm that combines chemical shifts from different nuclei into a score, which reflects the expected fraction of α- or β-structure.
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Protein Sci. 2006 Dec;15(12):2795-804. Epub 2006 Nov 6.
Sensitivity of secondary structure propensities to sequence differences between alpha- and gamma-synuclein: implications for fibrillation.
Marsh JA, Singh VK, Jia Z, Forman-Kay JD.