The recruitment of leukocytes from the flowing bloodstream is a very rapid process that requires special mechanisms for the establishment of leukocyte-endothelium contacts.

• 血流状态下白细胞的募集是一个非常快速的过程，需要特别的机制建立白细胞与内皮细胞间的联系，选择素家族代表了一类适应这一特殊目的的黏附分子。