What type of family of cellcell interactions is important fo

What type of family of cell-cell interactions is important for causing your white blood cells to roll along on the inside surface of your blood vessel?

Solution

Carbohydrate ligands on the circulating leukocytes bind to selectin molecules on the inner wall of the blood vessel with marginal affinity. This causes the white blood cells to slow down and begin rolling along the inner surface of the vessel wall. During this rolling motion, transitory bonds are formed and broken between selectins and their ligands.