Selectins Differ from Integrins in Which One of the Following

Multiple Choice

Selectins differ from integrins in which one of the following ways?

A) Selectins are expressed only on endothelial cells and integrins are expressed only on leukocytes.
B) Selectins are important mediators of leukocyte adhesion to endothelium,but integrins are not.
C) Selectins bind carbohydrate ligands,but integrins do not.
D) Selectins mediate rolling of leukocytes on endothelium,but integrins do not.
E) Selectins are a family of homologous molecules,but integrins are not.