Additional file 4: Figure S4. of In vitro biological responses to nanofibrillated cellulose by human dermal, lung and immune cells: surface chemistry aspect

Transmission electron microscopy analysis of THP-1 macrophages. Representative images of (a and b) untreated cells, (c and d) cells exposed to U-NFC, (e and d) cells exposed to A-NFC, (g and h) cells exposed to C-NFC. Cells were treated with 500 μg/ml of NFC for 24 h. The arrow indicate the presence of NFC agglomerates in the vicinity of the cells. (TIF 2251 kb)