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Schematic illustration of the principle and process of force tracing. a) The scheme of a functionalized AFM tip. The virus was covalently coupled to AFM tips via a heterobifunctional PEG linker. b) The schematic setup of force tracing based on AFM and PCI‐DAQ. c) Image of silicon with tethered viruses. d) The TEM image of the VLPs of HEV71 viruses shows that the VLPs are well‐dispersed and uniform.
