Additional file 2: Paracellular PMN migration across HIBCPP in FIB/SEM–raw data. FIB/SEM serial sections of paracellular polymorphonuclear neutrophil (PMN) migration through HIBCPP cells. Shows raw data SEM images from the condition HIBCPP+PMN + T-cells+E-30 + IL8. The video shows a paracellular migrating PMN presented in Fig. 8a, b in orthoslices. (AVI 12267 kb).