Fig. 2

FIB-SEM images of the inner structures of TNTs. a Schematic of the FIB-SEM dual beam system. b SEM image of a longitudinally cut TNT between two PANC-1 cells cultured in M0 CM. c SEM image of a PANC-1 cell cultured in M0 CM. The region to be cut by FIB is marked by the yellow dashed rectangle. d–g Series of cross sections along the TNT in (c). Each section was separated from the previous one by ~ 500 nm