For experiment with purified fragments, gold cantilevers (OMCL-TR4; Olympus, Tokyo, Japan) were functionalized with ClfBN2N3 via the NHS chemistry described above. In addition, oxide-sharpened microfabricated Si3Ni4 cantilevers (MSCT; Bruker) were also functionalized with ClfBN2N3 with polyethylene glycol (PEG) linkers as described elsewhere (21 (link), 37 (link)).
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