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The nomenclature for positions in [2:2]/[2:4] and [4:4]/[4:6] (Thornton23 classification) β hairpins; T indicates turn or loop positions, S indicates strand positions. The [2:2]/[2:4]-hairpins have type I′ or II′ β-turns. The S±even positions have their Hα atoms directed inward and display short Hα/Hα distances; they are designated as “non-H-bonded”. The S± odd positions have their Hα’s outwardly directed and are designated as “H-bonded pairs”.
