TABLE 2.

Identification of the interstrand H-bonds broken at each force peak

Force peak	Inter-strand H–bonds broken at N-terminal side	Inter-strand H–bonds broken at C-terminal side
40-nm peak	S2-S3*, S2-S8	S7-S11
53-nm peak	S5-S6

^*S2-S3 denotes H-bonds between S2 and S3.