It is worth mentioning that cytotoxicity was observed to be cell-dependent, e.g., a loss in viabilitywas observed for the human lung adenocarcinoma cell line (A549) and an increase in viability forthe human colon cancer (Caco2) and monkey kidney (Vero) cell lines [11,50]. The main tendency isdecreasing viability in time, the rate of which is faster for smaller flakes and for higher GO/rGO