Centre for Radiation, Chemicals and Environmental Hazards, Public Health England 1 article published in JoVE Biology Quantitation of Endothelial Cell Adhesiveness In Vitro Donna J. Lowe1, Kenneth Raj1 1Biological Effects Department, Centre for Radiation, Chemicals and Environmental Hazards, Public Health England We report an in vitro method that allows the quantitation of the actual number of adhesive cells within an endothelial cell monolayer.