Cells were fed with 14 ml of fresh media every 2 days. Cells were split when confluent by trypsin EDTA solution, before trypsination cells in flask were washed twice with 10 ml of PBS. Washed cell layers were topped with 3 ml of trypsin/EDTA solution and the flask was placed into incubator (37°C, 5% CO2) for3 minutes toallow cell detachment. After that, trypsin/EDTAsolutionwas inactivated with 7 ml of media and cell suspension was homogenised by pipetting several times up and down. Cells were counted manually using a Neubauer-type hematotocytometer, acalibrated counting chamber with identically duplicate counting areas. A cover glass placed over the chamber provides a depth of 0.1 mm.