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. 2021 Oct 12;11(6):20210018. doi: 10.1098/rsfs.2021.0018

Table 1.

Classes of secondary structure that DSSP defines.

letter ID number ID class of the secondary structure
G 0 310 helix (first helix)
H 1 α helix
I 2 π helix
E 3 β sheet
B 4 β bridge
T 5 helix turn
S 6 bend
C 7 coil (no SS found)