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. 2021 Feb 18;50(2):223–237. doi: 10.1007/s00249-020-01490-5

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© The Author(s) 2021

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Fig. 13 — Occurrence of the indicated intermediate after a contact time of 10 s. Recognition refers to traces in which fusion was not observed, but significant attractive forces (> 50 pN) were recorded (adapted from Oelkers et al. (2016) and Witt and Janshoff (2018))