3.1.1. Sample preparation
Place 0.5 ml of a suitable cell suspension (dilute cells in complete
medium without serum to about 1 105 to 2 105 cells
per ml) in a screw cap test tube. Add 0.1 ml of 0.4% trypan blue
stain. Mix thoroughly and keep for 5 min at 15–30 C (room
temperature). Fill a hemocytometer as for cell counting. Under a